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为21题添加示例代码
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‎01《招聘一个靠谱的iOS》面试题参考答案/为什么不推荐在init方法中使用点语法/nil对象调用点语法/AppDelegate.h‎

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//
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// AppDelegate.h
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// nil对象调用点语法
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//
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// Created by https://github.com/ChenYilong on 15/8/29.
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// Copyright (c) 2015年 http://weibo.com/luohanchenyilong/ 微博@iOS程序犭袁. All rights reserved.
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//
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#import <UIKit/UIKit.h>
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@interface AppDelegate : UIResponder <UIApplicationDelegate>
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@property (strong, nonatomic) UIWindow *window;
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@end
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‎01《招聘一个靠谱的iOS》面试题参考答案/为什么不推荐在init方法中使用点语法/nil对象调用点语法/AppDelegate.m‎

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//
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// AppDelegate.m
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// nil对象调用点语法
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//
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// Created by https://github.com/ChenYilong on 15/8/29.
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// Copyright (c) 2015年 http://weibo.com/luohanchenyilong/ 微博@iOS程序犭袁. All rights reserved.
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//
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#import "AppDelegate.h"
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@interface AppDelegate ()
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@end
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@implementation AppDelegate
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- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
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// Override point for customization after application launch.
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return YES;
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}
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- (void)applicationWillResignActive:(UIApplication *)application {
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// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
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// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
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}
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- (void)applicationDidEnterBackground:(UIApplication *)application {
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// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
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// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
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}
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- (void)applicationWillEnterForeground:(UIApplication *)application {
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// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
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}
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- (void)applicationDidBecomeActive:(UIApplication *)application {
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// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
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}
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- (void)applicationWillTerminate:(UIApplication *)application {
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// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
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}
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@end

‎01《招聘一个靠谱的iOS》面试题参考答案/为什么不推荐在init方法中使用点语法/nil对象调用点语法/Base.lproj/LaunchScreen.xib‎

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="7706" systemVersion="14D131" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES">
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<dependencies>
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<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="7703"/>
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<capability name="Constraints with non-1.0 multipliers" minToolsVersion="5.1"/>
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</dependencies>
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<objects>
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<placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
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<placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
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<view contentMode="scaleToFill" id="iN0-l3-epB">
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<rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
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<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
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<subviews>
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<label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text=" Copyright (c) 2015年 http://weibo.com/luohanchenyilong/ 微博@iOS程序犭袁. All rights reserved." textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" minimumFontSize="9" translatesAutoresizingMaskIntoConstraints="NO" id="8ie-xW-0ye">
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<rect key="frame" x="20" y="439" width="441" height="21"/>
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<fontDescription key="fontDescription" type="system" pointSize="17"/>
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<color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
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<nil key="highlightedColor"/>
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</label>
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<label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="为什么不推荐在init方法中使用点语法" textAlignment="center" lineBreakMode="middleTruncation" baselineAdjustment="alignBaselines" minimumFontSize="18" translatesAutoresizingMaskIntoConstraints="NO" id="kId-c2-rCX">
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<rect key="frame" x="20" y="140" width="441" height="43"/>
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<fontDescription key="fontDescription" type="boldSystem" pointSize="36"/>
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<color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
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<nil key="highlightedColor"/>
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</label>
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</subviews>
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<color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
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<constraints>
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<constraint firstItem="kId-c2-rCX" firstAttribute="centerY" secondItem="iN0-l3-epB" secondAttribute="bottom" multiplier="1/3" constant="1" id="5cJ-9S-tgC"/>
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<constraint firstAttribute="centerX" secondItem="kId-c2-rCX" secondAttribute="centerX" id="Koa-jz-hwk"/>
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<constraint firstAttribute="bottom" secondItem="8ie-xW-0ye" secondAttribute="bottom" constant="20" id="Kzo-t9-V3l"/>
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<constraint firstItem="8ie-xW-0ye" firstAttribute="leading" secondItem="iN0-l3-epB" secondAttribute="leading" constant="20" symbolic="YES" id="MfP-vx-nX0"/>
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<constraint firstAttribute="centerX" secondItem="8ie-xW-0ye" secondAttribute="centerX" id="ZEH-qu-HZ9"/>
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<constraint firstItem="kId-c2-rCX" firstAttribute="leading" secondItem="iN0-l3-epB" secondAttribute="leading" constant="20" symbolic="YES" id="fvb-Df-36g"/>
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</constraints>
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<nil key="simulatedStatusBarMetrics"/>
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<freeformSimulatedSizeMetrics key="simulatedDestinationMetrics"/>
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<point key="canvasLocation" x="548" y="455"/>
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</view>
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</objects>
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</document>

‎01《招聘一个靠谱的iOS》面试题参考答案/为什么不推荐在init方法中使用点语法/nil对象调用点语法/Base.lproj/Main.storyboard‎

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6211" systemVersion="14A298i" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
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<dependencies>
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<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6204"/>
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</dependencies>
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<scenes>
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<!--View Controller-->
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<scene sceneID="tne-QT-ifu">
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<objects>
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<viewController id="BYZ-38-t0r" customClass="ViewController" customModuleProvider="" sceneMemberID="viewController">
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<layoutGuides>
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<viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
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<viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
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</layoutGuides>
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<view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
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<rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
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<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
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<color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
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</view>
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</viewController>
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<placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
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</objects>
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</scene>
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</scenes>
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</document>

‎01《招聘一个靠谱的iOS》面试题参考答案/为什么不推荐在init方法中使用点语法/nil对象调用点语法/Images.xcassets/AppIcon.appiconset/Contents.json‎

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{
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"images" : [
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{
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"idiom" : "iphone",
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"size" : "29x29",
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"scale" : "2x"
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},
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{
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"idiom" : "iphone",
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"size" : "29x29",
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"scale" : "3x"
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},
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{
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"idiom" : "iphone",
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"size" : "40x40",
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"scale" : "2x"
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},
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{
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"idiom" : "iphone",
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"size" : "40x40",
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"scale" : "3x"
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},
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{
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"idiom" : "iphone",
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"size" : "60x60",
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"scale" : "2x"
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},
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{
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"idiom" : "iphone",
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"size" : "60x60",
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"scale" : "3x"
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},
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{
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"idiom" : "ipad",
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"size" : "29x29",
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"scale" : "1x"
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},
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{
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"idiom" : "ipad",
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"size" : "29x29",
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"scale" : "2x"
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},
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{
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"idiom" : "ipad",
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"size" : "40x40",
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"scale" : "1x"
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},
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{
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"idiom" : "ipad",
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"size" : "40x40",
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"scale" : "2x"
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},
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{
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"idiom" : "ipad",
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"size" : "76x76",
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"scale" : "1x"
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},
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{
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"idiom" : "ipad",
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"size" : "76x76",
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"scale" : "2x"
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}
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],
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"info" : {
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"version" : 1,
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"author" : "xcode"
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}
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}

‎01《招聘一个靠谱的iOS》面试题参考答案/为什么不推荐在init方法中使用点语法/nil对象调用点语法/Info.plist‎

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>CFBundleDevelopmentRegion</key>
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<string>en</string>
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<key>CFBundleExecutable</key>
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<string>$(EXECUTABLE_NAME)</string>
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<key>CFBundleIdentifier</key>
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<string>ChenYilong.$(PRODUCT_NAME:rfc1034identifier)</string>
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<key>CFBundleInfoDictionaryVersion</key>
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<string>6.0</string>
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<key>CFBundleName</key>
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<string>$(PRODUCT_NAME)</string>
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<key>CFBundlePackageType</key>
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<string>APPL</string>
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<key>CFBundleShortVersionString</key>
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<string>1.0</string>
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<key>CFBundleSignature</key>
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<string>????</string>
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<key>CFBundleVersion</key>
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<string>1</string>
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<key>LSRequiresIPhoneOS</key>
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<true/>
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<key>UILaunchStoryboardName</key>
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<string>LaunchScreen</string>
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<key>UIMainStoryboardFile</key>
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<string>Main</string>
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<key>UIRequiredDeviceCapabilities</key>
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<array>
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<string>armv7</string>
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</array>
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<key>UISupportedInterfaceOrientations</key>
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<array>
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<string>UIInterfaceOrientationPortrait</string>
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<string>UIInterfaceOrientationLandscapeLeft</string>
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<string>UIInterfaceOrientationLandscapeRight</string>
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</array>
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<key>UISupportedInterfaceOrientations~ipad</key>
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<array>
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<string>UIInterfaceOrientationPortrait</string>
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<string>UIInterfaceOrientationPortraitUpsideDown</string>
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<string>UIInterfaceOrientationLandscapeLeft</string>
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<string>UIInterfaceOrientationLandscapeRight</string>
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</array>
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</dict>
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</plist>

‎01《招聘一个靠谱的iOS》面试题参考答案/为什么不推荐在init方法中使用点语法/nil对象调用点语法/MaPerson.h‎

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//
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// MaPerson.h
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// nil对象调用点语法
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//
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// Created by https://github.com/ChenYilong on 15/8/30.
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// Copyright (c) 2015年 http://weibo.com/luohanchenyilong/ 微博@iOS程序犭袁. All rights reserved.
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//
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#import "Person.h"
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@interface MaPerson : Person
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@end

‎01《招聘一个靠谱的iOS》面试题参考答案/为什么不推荐在init方法中使用点语法/nil对象调用点语法/MaPerson.m‎

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//
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// MaPerson.m
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// nil对象调用点语法
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//
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// Created by https://github.com/ChenYilong on 15/8/30.
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// Copyright (c) 2015年 http://weibo.com/luohanchenyilong/ 微博@iOS程序犭袁. All rights reserved.
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//
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#import "MaPerson.h"
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@implementation MaPerson
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@synthesize lastName = _lastName;
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- (instancetype)init
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{
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self = [super init];
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if (self) {
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NSLog(@"🔴类名与方法名：%s（在第%d行），描述：%@", __PRETTY_FUNCTION__, __LINE__, NSStringFromClass([self class]));
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NSLog(@"🔴类名与方法名：%s（在第%d行），描述：%@", __PRETTY_FUNCTION__, __LINE__, NSStringFromClass([super class]));
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}
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return self;
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}
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- (void)setLastName:(NSString*)lastName
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{
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// if (![lastName isEqualToString:@"马"])
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// {
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// [NSException raise:NSInvalidArgumentException format:@"姓不是马"];
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// }
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// _lastName = lastName;
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_lastName = @"马";
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}
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@end

‎01《招聘一个靠谱的iOS》面试题参考答案/为什么不推荐在init方法中使用点语法/nil对象调用点语法/Person.h‎

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//
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// Person.h
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// nil对象调用点语法
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//
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// Created by https://github.com/ChenYilong on 15/8/29.
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// Copyright (c) 2015年 http://weibo.com/luohanchenyilong/ 微博@iOS程序犭袁. All rights reserved.
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//
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#import <Foundation/Foundation.h>
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@interface Person : NSObject
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@property (nonatomic, copy) NSString *lastName;
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@end

‎01《招聘一个靠谱的iOS》面试题参考答案/为什么不推荐在init方法中使用点语法/nil对象调用点语法/Person.m‎

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//
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// Person.m
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// nil对象调用点语法
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//
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// Created by https://github.com/ChenYilong on 15/8/29.
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// Copyright (c) 2015年 http://weibo.com/luohanchenyilong/ 微博@iOS程序犭袁. All rights reserved.
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// http://stackoverflow.com/a/18693694/3395008
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#import "Person.h"
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@implementation Person
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- (instancetype)init
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{
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self = [super init];
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if (self) {
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self.lastName = @"瞎写的";
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NSLog(@"🔴类名与方法名：%s（在第%d行），描述：%@", __PRETTY_FUNCTION__, __LINE__, NSStringFromClass([self class]));
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NSLog(@"🔴类名与方法名：%s（在第%d行），描述：%@", __PRETTY_FUNCTION__, __LINE__, self.lastName);
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}
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return self;
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}
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- (void)setLastName:(NSString*)lastName
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{
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_lastName = @"炎黄";
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}
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@end

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