dispatch_time_t timer = dispatch_time(DISPATCH_TIME_NOW, 7.0 * NSEC_PER_SEC);
dispatch_after(timer, dispatch_get_main_queue(), ^(void){
NSLog(@"GCD-----%@",[NSThread currentThread]);
});
dispatch_time_t timer = dispatch_time(DISPATCH_TIME_NOW, 7.0 * NSEC_PER_SEC);
dispatch_after(timer, dispatch_get_main_queue(), ^(void){
NSLog(@"GCD-----%@",[NSThread currentThread]);
});本文标题：一次性GCD定时器
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