小编spl*_*ter的帖子

我正在使用ARC而且在iOS6上我遇到了一个奇怪的崩溃:gdb remote返回了一个错误:E08

在堆栈跟踪中,之前的方法位于调用完成块的行上.我读了很多关于块和ARC的内容,但是我仍然对在后台环境中使用它们没有信心:

(简化方法并遗漏了一些代码)

- (void) method1: (void(^)(NSMutableArray *a)) completionBlock withFailedBlock:(void(^)(NSInteger errorCode,NSString *error)) failedBlock {
    __weak Controller *weakSelf = self;

    ...

    if(condition)
        completionBlock(weakSelf.a);

    //still do method2, since we might get updated data
    [weakself.service method2:^(NSMutableArray *a2) {
        weakSelf.shouldRefresh = NO;

        ...
        completionBlock(a2); //<-- sometimes crashes here
    } withFailedBlock:^(NSInteger errorCode, NSString *error) {
        failedBlock(errorCode, error);
    }];


} withFailedBlock:^(NSInteger errorCode, NSString *error) {
    failedBlock(errorCode, error);
}];

调用代码:

[[Controller sharedController] method1:^(NSMutableArray *a) {
    //save result in model (singleton)
    [Model sharedModel].a = a;
    [weakSelf refreshUI]; …