////  YXTimer.h//  YXTimer////  Created by YouXianMing on 14-10-2.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import <Foundation/Foundation.h>@class YXTimer;@protocol YXTimerDelegete <NSObject>- (void)YXTimerEvent:(YXTimer *)timer;@end@interface YXTimer : NSObject// 代理相关方法@property (nonatomic) NSTimeInterval              milliSecond; // 毫秒@property (nonatomic, assign) id<YXTimerDelegete> delegate;// block相关方法+ (instancetype)timerWithMilliSecondInterval:(NSTimeInterval)milliSecond                                       Block:(void (^)(YXTimer *timer))block;// 激活定时器 + 停止定时器- (void)start;- (void)stop; // 注意：要想让timer能被移除，一定要激活stop方法才行@end

////  YXTimer.m//  YXTimer////  Created by YouXianMing on 14-10-2.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#ifdef DEBUG#define YXTimer_DLog(fmt, ...) NSLog((@"YXTimer.m:%s:%d" fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);#else#define YXTimer_DLog(...)#endif#import "YXTimer.h"@interface YXTimer ()@property (nonatomic) BOOL isRunning;@property (nonatomic, copy) void (^block)(YXTimer *timer);@end@implementation YXTimer- (instancetype)init{    self = [super init];    if (self) {        _isRunning = NO;    }    return self;}- (instancetype)initWithBlock:(void (^)(YXTimer *timer))block {    self = [super init];        if (self) {        _isRunning = NO;        _block     = block;    }        return self;}- (void)start {    _isRunning = YES;    [self runTimer];}- (void)stop {    _isRunning = NO;}+ (instancetype)timerWithMilliSecondInterval:(NSTimeInterval)milliSecond                                       Block:(void (^)(YXTimer *timer))block {    YXTimer *timer = [[YXTimer alloc] initWithBlock:block];    timer.milliSecond = milliSecond;        return timer;}- (void)runTimer {        if (self.isRunning) {                NSTimeInterval  milliSecond = 1000.f;        if (_milliSecond > 0) {            milliSecond = _milliSecond;        }                dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(milliSecond * NSEC_PER_MSEC)), dispatch_get_main_queue(), ^{            if (self.block) {                self.block(self);            }                        if (_delegate) {                [_delegate YXTimerEvent:self];            }                        [self runTimer];        });    }}- (void)dealloc {    [self stop];    YXTimer_DLog(@"资源释放了");}@end

////  ViewController.m//  YXTimer////  Created by YouXianMing on 14-10-2.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import "ViewController.h"#import "YXTimer.h"@interface ViewController ()<YXTimerDelegete>@property (nonatomic, strong) YXTimer   *timer;@property (nonatomic, strong) UILabel   *label;@property (nonatomic, strong) NSArray   *dataArray;@property (nonatomic)         NSInteger  count;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];        _dataArray = @[@"Y.X. Loading .",                   @"Y.X. Loading ..",                   @"Y.X. Loading ...",                   @"Y.X. Loading ....",                   @"Y.X. Loading .....",                   @"Y.X. Loading ......",                   @"Y.X. Loading ......."];        _timer             = [YXTimer new];    _timer.milliSecond = 100;    _timer.delegate    = self;    [_timer start];        _label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 300, 30)];    _label.textAlignment = NSTextAlignmentLeft;    _label.font = [UIFont fontWithName:@"HelveticaNeue-Thin" size:20.f];    _label.textColor = [UIColor redColor];    _label.center = self.view.center;    [self.view addSubview:_label];    }- (void)YXTimerEvent:(YXTimer *)timer{    _label.text = _dataArray[_count++ % _dataArray.count];}@end