@property (读写，非原子，赋值，getter = isCancelled) BOOL已取消- xcode6导致编译器错误

Question

我一直在用AFNetworking开发Xcode5.0.2，一切都运行得很好。当我升级到Xcode6GM时，我得到了下面这行的警告：Auto property synthesis will not synthesize property 'cancelled' because it is 'readwrite' but it will be synthesized 'readonly' via another property：

@property (readwrite, nonatomic, assign, getter = isCancelled) BOOL cancelled

和错误：Use of undeclared identifier '_cancelled'

- (void)cancel {
    [self.lock lock];
    if (![self isFinished] && ![self isCancelled]) {
        [self willChangeValueForKey:@"isCancelled"];
        _cancelled = YES; <-- THIS LINE CAUSES THE ERROR
        [super cancel];
        [self didChangeValueForKey:@"isCancelled"];

        // Cancel the connection on the thread it runs on to prevent race conditions
        [self performSelector:@selector(cancelConnection) onThread:[[self class] networkRequestThread] withObject:nil waitUntilDone:NO modes:[self.runLoopModes allObjects]];
    }
    [self.lock unlock];
}

我在SO上找到了this answer，并下载了Xcode5.1.1，按照建议复制库，将基础sdk设置为7.1，但错误仍然存在

有什么建议吗？

Answer 1

NSOperation更改了几个属性的读取访问器名称，取消了-> isCancelled并完成了-> isFinished (我想)。以前它们是方法，但现在它们是属性。

AFNetworking需要更新到具有固定合成的版本。AFURLConnectionOperation.m文件现在具有以下修复此问题的功能。

@synthesize cancelled = _cancelled;