[__NSArrayM removeAllObjects] 崩溃的解决

崩溃栈

0 libobjc.A.dylib _objc_msgSend :16 (in libobjc.A.dylib)
1 CoreFoundation _CFRelease :524 (in CoreFoundation)
2 CoreFoundation -[__NSArrayM removeAllObjects] :284 (in CoreFoundation)

一般这种情况是多线程操作了NSMutableArray 造成的。可以加一个线程保护。