iOS 倒计时放大特效

前言

写一个跑步的app,跑之前倒计时开始,于是写一个特效,直接上代码吧~简单粗暴

#import "ViewController.h"
#import "SWKit.h"
#import "ATCountTimeDownManager.h"


@interface ViewController ()
@property(nonatomic,strong) UILabel *countDown;
@property(nonatomic,strong) UIView *aphView;
@end

@implementation ViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  
  self.view.backgroundColor = [SWKit colorWithHexString:@"#0074DA"];
  
  [self secountDown];
  
  [self beginStar];

}
-(void)secountDown{
  _countDown =[[UILabel alloc]init];
  _countDown.textColor = [UIColor whiteColor];;
  _countDown.font =[UIFont boldSystemFontOfSize:100];
  _countDown.textAlignment = 1;
  [self.view addSubview:_countDown];
  _countDown.x = (SCREEN_WIDTH - 100)/2;
  _countDown.y = (SCREEN_HEIGHT - 100)/2;
  _countDown.width =_countDown.height = 100;
 
  _aphView = [UIView new];
  _aphView.backgroundColor = [UIColor whiteColor];
  [self.view addSubview:_aphView];
  _aphView.frame = CGRectMake(0, 0, 100, 100);
  _aphView.centerX = _countDown.centerX;
  _aphView.centerY = _countDown.centerY;
  _aphView.alpha = 0;
  
  _aphView.layer.cornerRadius = 50.f;
  
}

- (void)getCuntDown:(NSInteger)second{
  weakSelf(self);
  if (second == 4) {
      second = 3;
  }
  _countDown.text=[NSString stringWithFormat:@"%ld",(long)second];
  _countDown.alpha = 1;
  _aphView.alpha = 0;
  [UIView animateWithDuration:0.8 animations:^{
      weakSelf.countDown.alpha = 0.8;//透明度
      weakSelf.aphView.alpha = 0.1;
      weakSelf.countDown.transform = CGAffineTransformMakeScale(1.5, 1.5);//放大值
       weakSelf.aphView.transform = CGAffineTransformMakeScale(10, 10);//放大值
  } completion:^(BOOL finished) {
      weakSelf.aphView.alpha = weakSelf.countDown.alpha =  0;
      weakSelf.countDown.transform = weakSelf.aphView.transform = CGAffineTransformIdentity;//回复原大小
  }];
  
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
  [self beginStar];
}


- (void)beginStar{
  ATCountTimeDownManager *manager= [ATCountTimeDownManager new];
  [manager countDownWithTime:4 completeBlock:^(NSInteger countDown) {
      if (countDown == 0) {
          [manager destoryTimer];
      } else {
          [self getCuntDown:countDown];
      }
  }];
}

SWKit 以及 ATCountTimeDownManager 我会上传代码到git,逻辑很简单,一看就懂哈! 这个是效果图,有需求可star 支持一下~✨

QQ20190529-162137.gif