解决Collection <__NSArrayM: 0xb550c30> was mutated while being enumerated.-
2014-11-28 09:43
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2013-09-22 16:45:42.229 ViewTest[2638:c07] *** Terminating app due to uncaught exception ‘NSGenericException’, reason: ‘*** Collection <__NSArrayM: 0xb550c30> was mutated while being enumerated.’
当程序出现这个提示的时候,是因为你一边便利数组,又同时修改这个数组里面的内容,导致崩溃,网上的方法如下:
这种方法就是在定义一个一模一样的数组,便利数组A然后操作数组B
今天终于找到了一个更快接的删除数组里面的内容以及修改数组里面的内容的方法:
利用block来操作,根据查阅资料,发现block便利比for便利快20%左右,这个的原理是这样的:
找到符合的条件之后,暂停遍历,然后修改数组的内容
这种方法非常简单哟
但是只限于修改一次的情况下,如果需要修改多次,可以用一下方法:
下面一个简单的出现这类错误的用法:
应该改为:
在对数组内容进行改变的时候,要灵活使用备份数组。
当程序出现这个提示的时候,是因为你一边便利数组,又同时修改这个数组里面的内容,导致崩溃,网上的方法如下:
今天终于找到了一个更快接的删除数组里面的内容以及修改数组里面的内容的方法:
找到符合的条件之后,暂停遍历,然后修改数组的内容
这种方法非常简单哟
但是只限于修改一次的情况下,如果需要修改多次,可以用一下方法:
下面一个简单的出现这类错误的用法:
NSMutableArray * arrayTemp = xxx; for (NSDictionary * dic in arrayTemp) { if (condition){ [arrayTemp removeObject:dic]; } }
应该改为:
NSMutableArray * arrayTemp = xxx; NSArray * array = [NSArray arrayWithArray: arrayTemp]; for (NSDictionary * dic in array) { if (condition){ [arrayTemp removeObject:dic]; } }
在对数组内容进行改变的时候,要灵活使用备份数组。
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