iOS 遍历数组crash— <__NSArrayM: 0x***> was mutated while being enumerated

控制台输出crash 日志：

 Terminating app due to uncaught exception 'NSGenericException', reason: '*** Collection <__NSArrayM: 0x7ae683e0> was mutated while being enumerated.'

crash代码

for (NSDictionary *dict in self.dataArray) {
    if ([dict[@"type"] intValue] == 1) {
        [self.dataArray removeObject:dict];
      }
}

crash 原因：

• for循环遍历数组时，操作数组 removeObject，造成不同线程同时对数组进行读和写操作，引起crash;

解决方法：

• 通过block块遍历数组

      [self.dataArray enumerateObjectsUsingBlock:^(NSDictionary * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
         if ([obj[@"type"] intValue] == 1) {
              *stop = YES;
              if (*stop) {
                  [self.dataArray removeObject:obj];
              }
           }
      }];