IOS delays program execution and iOS Program Execution

IOS delays program execution and iOS Program Execution

// Gets stuck in the main thread

[NSThread sleepForTimeInterval: Time (seconds)];

// After a delayed task is customized, it will not be stuck in the main thread and will be executed in the main thread

[Self defined mselector: @ selector (method name) withObject: method parameter afterDelay: Time (seconds)];

// GCD delayed execution

Dispatch_after (dispatch_time (DISPATCH_TIME_NOW, (int64_t) (Time (seconds) * NSEC_PER_SEC), dispatch_get_main_queue (), ^ {

// Code ....

});