Object-C定时器,封装GCD定时器的必要性!!! (二)

上一篇:Object-C定时器,封装GCD定时器的必要性!!! (一)

上一篇认识了Object-C中的几种定时器,这一篇将Dispatch定时器(GCD定时器)封装起来.

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#import <Foundation/Foundation.h>

@interface DispatchTimer : NSObject

/**

创建dispatch定时器

@param timerName 定时器名称

@param interval 时间间隔

@param queue 运行的队列(默认为全局并发队列)

@param repeats 是否重复

@param action 执行的动作

*/

+ (void)scheduleDispatchTimerWithName:(NSString *)timerName

timeInterval:(double)interval

queue:(dispatch_queue_t)queue

repeats:(BOOL)repeats

action:(dispatch_block_t)action;

/**

取消dispatch定时器

@param timerName 定时器名称

*/

+ (void)cancelTimerWithName:(NSString *)timerName;

/**

取消所有创建的dispatch定时器

*/

+ (void)cancelAllTimer;

@end

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#import "DispatchTimer.h"

@implementation DispatchTimer

static NSMutableDictionary * timerContainer;

+ (void)initialize

{

timerContainer = [NSMutableDictionary dictionary];

}

+ (void)scheduleDispatchTimerWithName:(NSString *)timerName timeInterval:(double)interval queue:(dispatch_queue_t)queue repeats:(BOOL)repeats action:(dispatch_block_t)action

{

if (nil == timerName) {

　　　　　return;

}

if (nil == queue) {//默认为全局并发队列

queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

}

dispatch_source_t timer = [

timerContainer objectForKey:timerName];

if (nil == timer) {//创建

timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);

[timerContainer setObject:timer forKey:timerName];

//执行timer 一定放在这里 放下面会造成野地址

dispatch_resume(timer);

}

dispatch_time_t start = dispatch_time(DISPATCH_TIME_NOW, interval * NSEC_PER_SEC);

dispatch_source_set_timer(timer, start, interval * NSEC_PER_SEC, 0);

__weak typeof(self) weakSelf = self;

dispatch_source_set_event_handler(timer, ^{

action();

if (!repeats) {

[weakSelf cancelTimerWithName:timerName];

}

});

}

+ (void)cancelTimerWithName:(NSString *)timerName

{

dispatch_source_t timer = [timerContainer objectForKey:timerName];

if (nil == timer) {

　　　　  return;

}

[timerContainer removeObjectForKey:timerName];

dispatch_source_cancel(timer);

}

+ (void)cancelAllTimer

{

[timerContainer enumerateKeysAndObjectsUsingBlock:^(NSString * timerName, 　　　　　 　　　　　dispatch_source_t timer, BOOL * _Nonnull stop) {

[timerContainer removeObjectForKey:timerName];

dispatch_source_cancel(timer);

}];

}

@end

为了方便调用：将定时器的创建、销毁方法设计为类方法。

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