malloc: *** error: incorrect checksum for freed object - object was probably modified after being freed
2017-09-30 14:43
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发生这种错误的原因是： 操作一个已经被释放的指针 访问一个已经被释放的指针
例如：
iOS8加载系统相册库的时候 用到很多系统的block 为了避免强引用 我们会创建一个弱指针 指向self
但是因为加载相册是异步操作的 所以如果使用弱引用 就会报上面的错误
解决办法：
在block中对当前的弱引用 再进行强引用即可
例如：
iOS8加载系统相册库的时候 用到很多系统的block 为了避免强引用 我们会创建一个弱指针 指向self
但是因为加载相册是异步操作的 所以如果使用弱引用 就会报上面的错误
解决办法：
在block中对当前的弱引用 再进行强引用即可
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