Nstimer usage, pause, continue, initialize

Nstimer usage, pause, continue, initialize

Reprint: http://blog.csdn.net/zhuzhihai1988/article/details/7742881

How to use Nstimer

1. Initialization

+ (Nstimer *) Timerwithtimeinterval: (nstimeinterval) TI target: (ID) atarget selector: (SEL) Aselector userInfo: (ID) UserInfo repeats: (BOOL) Yesorno;

+ (Nstimer *) Scheduledtimerwithtimeinterval: (nstimeinterval) TI target: (ID) atarget selector: (SEL) Aselector UserInfo :(ID) UserInfo repeats: (BOOL) Yesorno;

Note: Without scheduled initialization, manual Addtimer:formode is required: Add the timer to a runloop.

The scheduled initialization method will be added directly to the current runloop with the default mode.

Scheduledtimerwithtimeinterval: (nstimeinterval) seconds

Book a timer and set a time interval.

Represents a value that enters a time interval object, in seconds, of a >0 floating-point type, and if the value is <0, the system defaults to 0.1

Target: (ID) atarget

Represents the Sent object, such as self

Selector: (SEL) Aselector

Method selector, which, within the time interval, chooses to invoke an instance method

UserInfo: (ID) userInfo

This parameter can be nil, and the timer is retained and freed by the object you specify when the timer fails.

Repeats: (BOOL) Yesorno

When yes, the timer loops continuously until it expires or is released, and when no, the timer is sent out once and then fails.

Invocation: (nsinvocation *) invocation

Example:

Nstimer *timer = [Nstimer scheduledtimerwithtimeinterval:10.0 target:self selector: @selector (timerfired:) UserInfo: Nil Repeats:no];

Or

Nstimer *MyTimer = [nstimertimerwithtimeinterval:3.0 target:selfselector:@ Selector(timerfired:) userInfo:nilrepeats:NO];

[[Nsrunloopcurrentrunloop]addtimer:mytimerformode:nsdefaultrunloopmode];

2. Trigger (START)

When the timer is created (not scheduled, added to Runloop, the timer is automatically triggered after the timeinterval seconds specified at initialization.

You can use the-(void) Fire method to trigger the timer immediately;

Note: You can use the This method to fire a repeating timer without interrupting its regular firing schedule. If the timer is non-repeating, it's automatically invalidated after firing, even if its scheduled fire date have not Arriv Ed.

The timer is triggered immediately after calling this method in a repeating timer, but does not interrupt its previous execution plan;

Calling this method in a timer that does not execute repeatedly will invalidate the timer immediately after it is triggered.

3. Stop

-(void) invalidate;

This is the only way to move the timer out of the Runloop.

Note:

The Nstimer can be accurate to 50-100 milliseconds.

The Nstimer is not absolutely accurate, and the intermediate time-consuming or blocking misses the next point, then the next point passes.

Add a category to Nstimer

#import "TFTimer.h"


#import <Foundation/Foundation.h>

@interface Nstimer (tfaddition)

-(void) Pausetimer;
-(void) Resumetimer;

@end




#import "TFTimer.h"


@implementation Nstimer (tfaddition)


-(void) pausetimer{

if (![ Self IsValid]) {
return;
}

[Self setfiredate:[nsdate distantfuture]]; If you give me a deadline, I hope it's 4001-01-01 00:00:00 +0000


}


-(void) resumetimer{

if (![ Self IsValid]) {
return;
}

[Self setfiredate:[nsdate datewithtimeintervalsincenow:0]];
[Self setfiredate:[nsdate date]];

}

@end

Nstimer usage, pause, continue, initialize