Merge pull request ChenYilong#80 from machinefixer/revised_demo_13

修改 Demo_13

Author: ChenYilong

01《招聘一个靠谱的iOS》面试题参考答案/Demo_13题_用@property声明的NSString或NSArray_NSDictionary_经常使用copy关键字_为什么_如果改用strong关键字_可能造成什么问题/CYLMutableArrayCopyDmo/CYLArrayCopyDmo/ViewController.m

@@ -16,8 +16,8 @@ @implementation ViewController
 
 - (void)viewDidLoad {
     [super viewDidLoad];
-    NSMutableArray *mutableArray = [[NSMutableArray alloc] init];
     NSArray *array = @[ @1, @2, @3, @4 ];
+    NSMutableArray *mutableArray = [NSMutableArray arrayWithArray:array];
 
     self.array = mutableArray;
     [mutableArray removeAllObjects];;

01《招聘一个靠谱的iOS》面试题参考答案/《招聘一个靠谱的iOS》面试题参考答案（上）.md

@@ -1226,8 +1226,9 @@ void objc_setProperty(id self, SEL _cmd, ptrdiff_t offset, id newValue, BOOL ato
 然后进行下面的操作：
 
  ```Objective-C
-    NSMutableArray *mutableArray = [[NSMutableArray alloc] init];
     NSArray *array = @[ @1, @2, @3, @4 ];
+    NSMutableArray *mutableArray = [NSMutableArray arrayWithArray:array];
+    
     self.array = mutableArray;
     [mutableArray removeAllObjects];;
     NSLog(@"%@",self.array);