Variable 'bop' is uninitialized when captured by block

代码：

- (void)doTest {

    NSBlockOperation * bop = [NSBlockOperation blockOperationWithBlock:^{

        if (!bop.isCancelled) {

            // ...

            // doSomething

        }

    }];

    [mQueue addOperation:bop];

}

这段代码是有明显问题的，如果用Analyze来检查的话，就会有警告Variable 'bop' is uninitialized when captured by block.

其实很简单，问题出在block内部对于bop的使用上. 在进入block的时候，bop是一个未初始化的变量.

解决方法很简单，加上__block修饰为block变量就好了.

- (void)doTest {

    __block NSBlockOperation * bop = [NSBlockOperation blockOperationWithBlock:^{

        if (!bop.isCancelled) {

            // ...

            // doSomething

        }

    }];

    [mQueue addOperation:bop];

}

巴特西

Variable 'bop' is uninitialized when captured by block

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