小编Fli*_*Vir的帖子

我看过以下用过:

double delayInSeconds = 2.0;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
    //code to be executed on the main queue after delay
    [self doSometingWithObject:obj1 andAnotherObject:obj2];
});

但它不应该在块中使用弱自我吗？

__weak typeof(self) weakSelf = self;
double delayInSeconds = 2.0;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
    //code to be executed on the main queue after delay
    [weakSelf doSometingWithObject:obj1 andAnotherObject:obj2];
});

我对GCD和Blocks很新,并尝试找出最正确的用法.非常感谢对此的任何指导.

要唯一标识 iOS 6 及更高版本中的应用程序，请使用以下代码：

UIDevice.currentDevice().identifierForVendor

有 Mac OSX 的等效程序吗？