解决 Crash:Collection <__NSArrayM: 0x61000024df50> was mutated while being enumerated
2014-05-23 09:32
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当你对一个可变数组( NSMutabeArray)进行枚举的同时又去修改他的内容,比如搜索到某个符合的对象再删除它。就会引发这样的crash的信息:
Collection <__NSArrayM: 0x61000024df50> was mutated while being enumerated.
用下面的这个方法替代上面的,这样就可以正确的删除了。
Collection <__NSArrayM: 0x61000024df50> was mutated while being enumerated.
#import "AppDelegate.h" @implementation AppDelegate - (void)applicationDidFinishLaunching:(NSNotification *)aNotification { // Insert code here to initialize your application NSDate* date=[NSDate date]; NSMutableArray* myArray=[NSMutableArray arrayWithObjects:date,@"hello",nil]; NSLog(@"遍历前:%@",myArray); // for (id item in myArray) //这样会引发crash // { // if ([item isEqualTo:date]) // { // NSLog(@"当前的位置 %lu",(unsigned long)[myArray indexOfObject:item]); // [myArray removeObject:item];//在遍历这个数组的时候,你又去删除它里面的元素,会引发这样的crash: Collection <__NSArrayM: 0x61000005f650> was mutated while being enumerated. // } // } // //解决办法,用下面这个for循环代替上面的 newArray会把myArray里面的每一个对象retain一次放到自己里面。因此变遍历自己的,找到之后再从真正需要移走的可变数组再把找到的对象移走即可。 NSArray* newArray=[NSArray arrayWithArray:myArray]; for (int i =0 ; i<[newArray count]; i++) { id item=[newArray objectAtIndex:i]; if ([item isEqualTo:date]) { [myArray removeObject:item]; } } NSLog(@"遍历后:%@",myArray); } @end
用下面的这个方法替代上面的,这样就可以正确的删除了。
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