问题复制的NSMutableArray

问题描述

我想一个阵列复制到另一个：

 的NSMutableArray * itemsCopy = [[NSMutableArray里的alloc] initWithArray：self.items copyItems：YES];
 

但我得到的错误：

  ***终止应用程序由于未捕获的异常'NSInvalidArgumentException'，原因：' -  [项目copyWithZone：]：无法识别的选择发送到实例0x5a74900
在第一掷***调用堆栈：
（
    0的CoreFoundation 0x025afc99 __exception preprocess + 185
    1 libobjc.A.dylib 0x026fd5de objc_exception_throw + 47
    2的CoreFoundation 0x025b17ab  -  [NSObject的（NSObject的）doesNotRecognizeSelector：] + 187
    3的CoreFoundation 0x02521496 ___forwarding___ + 966
    4的CoreFoundation 0x02521052 _CF_forwarding_ prep_0 + 50
    5的CoreFoundation 0x025108fa  -  [NSObject的（NSObject的）复制] + 42
    6的CoreFoundation 0x025ab732  -  [NSArray的initWithArray：范围：copyItems：] + 290
    7的CoreFoundation 0x02513963  -  [NSArray的initWithArray：copyItems：] + 99
    8 MyViewController 0x0000787d  -  [MyViewController的tableView：didSelectRowAtIndexPath方法：] + 258
    9 UIKit的0x003968f8  -  [UITableView的_selectRowAtIndexPath：动画：的scrollPosition：notifyDelegate：] + 1140
    10 UIKit的0x0038d1de  -  [UITableView的_userSelectRowAtIndexPath：] + 219
    11基金0x000a404e __NSFireDelayedPerform + 441
    12的CoreFoundation 0x025910c3 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 19
    13的CoreFoundation 0x02592704 __CFRunLoopDoTimer + 1364
    14的CoreFoundation 0x024ef089 __CFRunLoopRun + 1817
    15的CoreFoundation 0x024ee600 CFRunLoopRunSpecific + 208
    16的CoreFoundation 0x024ee521 CFRunLoopRunInMode + 97
    17 GraphicsServices 0x02db52c8 GSEventRunModal + 217
    18 GraphicsServices 0x02db538d GSEventRun + 115
    19 UIKit的0x00332e8f UIApplicationMain + 1160
    20 MyViewController 0x0000210c主+ 102
    21 MyViewController 0x0000209d启动+ 53
）
扔NSException的一个实例后终止叫
 

解决方案

您需要确保所有的内容的 self.items 的采用在NSCopying协议。

如果你只是想要一个浅拷贝，发送 -mutableCopy 消息 self.items 。

 的NSMutableArray * itemsCopy = [self.items mutableCopy]
 

I am trying to copy one array to another:

NSMutableArray *itemsCopy = [[NSMutableArray alloc] initWithArray:self.items copyItems:YES];

but I get the error:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Item copyWithZone:]: unrecognized selector sent to instance 0x5a74900'
*** Call stack at first throw:
(
    0   CoreFoundation                      0x025afc99 __exceptionPreprocess + 185
    1   libobjc.A.dylib                     0x026fd5de objc_exception_throw + 47
    2   CoreFoundation                      0x025b17ab -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
    3   CoreFoundation                      0x02521496 ___forwarding___ + 966
    4   CoreFoundation                      0x02521052 _CF_forwarding_prep_0 + 50
    5   CoreFoundation                      0x025108fa -[NSObject(NSObject) copy] + 42
    6   CoreFoundation                      0x025ab732 -[NSArray initWithArray:range:copyItems:] + 290
    7   CoreFoundation                      0x02513963 -[NSArray initWithArray:copyItems:] + 99
    8   MyViewController                          0x0000787d -[MyViewController tableView:didSelectRowAtIndexPath:] + 258
    9   UIKit                               0x003968f8 -[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:] + 1140
    10  UIKit                               0x0038d1de -[UITableView _userSelectRowAtIndexPath:] + 219
    11  Foundation                          0x000a404e __NSFireDelayedPerform + 441
    12  CoreFoundation                      0x025910c3 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 19
    13  CoreFoundation                      0x02592704 __CFRunLoopDoTimer + 1364
    14  CoreFoundation                      0x024ef089 __CFRunLoopRun + 1817
    15  CoreFoundation                      0x024ee600 CFRunLoopRunSpecific + 208
    16  CoreFoundation                      0x024ee521 CFRunLoopRunInMode + 97
    17  GraphicsServices                    0x02db52c8 GSEventRunModal + 217
    18  GraphicsServices                    0x02db538d GSEventRun + 115
    19  UIKit                               0x00332e8f UIApplicationMain + 1160
    20  MyViewController                          0x0000210c main + 102
    21  MyViewController                          0x0000209d start + 53
)
terminate called after throwing an instance of 'NSException'

解决方案

You need to make sure all the contents of self.items adopt the NSCopying protocol.

If you just want a shallow copy, send the -mutableCopy message to self.items.

NSMutableArray *itemsCopy = [self.items mutableCopy];

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