Several methods of delayed execution (sleep) of iOS

1. The most straightforward approach:

[self performselector:@selector (deleymethod) withobject: nil afterdelay:1. 0];

This method requires that it must be executed in the main thread, otherwise it is not valid. is a non-blocking method of execution that has not yet been found to cancel execution.

Cons: Write a method for the delay every time.

2. Use Nstread

[Nsthread Sleepfortimeinterval:0. 06];

This method can be executed in both the main thread and the child thread. is a blocking method of execution, which is placed in a sub-thread, so as not to get stuck in the interface, no way to cancel execution.

3.用GCD。

　　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 being executed on the main queue after delay

});

In this way, the executing thread can be selected in the parameter. is a non-blocking execution method that does not find a way to cancel execution.

4. Timer: Nstimer

[Nstimer scheduledtimerwithtimeinterval:1. 0f target:self selector:@selector (  Delaymethod) userInfo: nil repeats:NO];

This method requires that it must be executed in the main thread, otherwise it is not valid. is a non-blocking execution method that can be invalidate by the Nstimer class-(void);

5. Using Nsoperationqueue, execute in the next main loop of the application:

<span style="Background-color:rgb (255, 255, 255); ><span style="color: #000000;" >[[nsoperationqueue Mainqueue] addoperationwithblock:ablock];</span></span>

This and call Performselector:with Afterdelay of 0.0f equivalent

6. May not be a good way to use the completion parameter of animation

[UIView animatewithduration:0. 0 Delay:5. 0 Options: Uiviewanimationoptionallowuserinteraction animations:^{

} completion:^ (BOOL finished) {

//do stuff here

}];

Several methods of delayed execution (sleep) of iOS