iOS实现倒计时显示 时 分 秒

1.创建一个类继承自UILabel.（用来显示 时 分 秒）

.h文件

//
//  TimeLable.h
//  timer
//
//  Created by limin on 17/8/15.
//  Copyright © 2017年 none. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface TimeLable : UILabel
@property (nonatomic,assign)NSInteger second;
@property (nonatomic,assign)NSInteger minute;
@property (nonatomic,assign)NSInteger hour;
@end

//
//  TimeLable.m
//  timer
//
//  Created by limin on 17/8/15.
//  Copyright © 2017年 none. All rights reserved.
//

#import "TimeLable.h"
@interface TimeLable ()
@property (nonatomic, strong)NSTimer *timer;
@end
@implementation TimeLable

- (id)initWithFrame:(CGRect)frame{
    self = [super initWithFrame:frame];
    if (self) {
        self.textAlignment = NSTextAlignmentCenter;
        self.timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timeHeadle) userInfo:nil repeats:YES];
    }
    return self;
}

- (void)timeHeadle{
    
    self.second--;
    if (self.second==-1) {
        self.second=59;
        self.minute--;
        if (self.minute==-1) {
            self.minute=59;
            self.hour--;
        }
    }
    if (self.hour>0) {
        self.text = [NSString stringWithFormat:@"%.2ld:%.2ld:%.2ld",(long)self.hour,(long)self.minute,(long)self.second];
    }else if (self.hour==0) {
        self.text = [NSString stringWithFormat:@"%.2ld:%.2ld",(long)self.minute,(long)self.second];
    }else if (self.minute==0)
    {
        self.text = [NSString stringWithFormat:@"%.2ld",(long)self.second];
    }
    
    if (self.second==0 && self.minute==0 && self.hour==0) {
        [self.timer invalidate];
        self.timer = nil;
    }
}


@end

#import "TimeLable.h"

- (void)viewDidLoad {
    [super viewDidLoad];
    TimeLable *lable = [[TimeLable alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
    lable.hour = 10;
    lable.minute = 1;
    lable.second = 00;
    [self.view addSubview:lable];
}

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