iOS倒計時動畫

效果圖

製作成gif之後，幀率變快了，看起來很彆扭，實際上是每秒執行一次的

.h 檔案

@inte***ce countdownview : uiview

@property (nonatomic, assign) long long time;
@property (nonatomic, assign, readonly) long long remaintime;
@end
@inte***ce countdownlabel : uiview
@property (nonatomic, assign) catransitionsubtype subtype;
@property (nonatomic, copy) nsstring *text;
@end

#import "countdownview.h"

@inte***ce countdownview ()
@property (nonatomic, strong) countdownlabel *hourlabel1;
@property (nonatomic, strong) countdownlabel *hourlabel2;
@property (nonatomic, strong) uiimageview *dot1;
@property (nonatomic, strong) countdownlabel *minutelabel1;
@property (nonatomic, strong) countdownlabel *minutelabel2;
@property (nonatomic, strong) uiimageview *dot2;
@property (nonatomic, strong) countdownlabel *secondlabel1;
@property (nonatomic, strong) countdownlabel *secondlabel2;
@property (nonatomic, assign) bool stop;
@property (nonatomic, assign) bool running;
@end
@implementation countdownview
- (instancetype)init
- (instancetype)initwithframe:(cgrect)frame
return self;
}- (void)setupsubviews
- (void)settime:(long long)timeelse
}- (void)timeout:(long long)timeelse
self.hourlabel1.text = [nsstring stringwithformat:@"%ld",hour/10];
self.hourlabel2.text = [nsstring stringwithformat:@"%ld",hour%10];
self.minutelabel1.text = [nsstring stringwithformat:@"%ld",min/10];
self.minutelabel2.text = [nsstring stringwithformat:@"%ld",min%10];
self.secondlabel1.text = [nsstring stringwithformat:@"%ld",sec/10];
self.secondlabel2.text = [nsstring stringwithformat:@"%ld",sec%10];
dispatch_after(dispatch_time(dispatch_time_now, (int64_t)(1 * nsec_per_sec)), dispatch_get_main_queue(), ^
});}@end
@inte***ce countdownlabel ()
@property (nonatomic, strong) cagradientlayer *gradient;
@property (nonatomic, strong) uilabel *textlabel;
@end
@implementation countdownlabel
- (instancetype)init
- (instancetype)initwithframe:(cgrect)frame
return self;
}- (void)settext:(nsstring *)text
_text = text;
self.textlabel.text = text;
}- (void)layoutsubviews
// 動畫
- (void)fadelayer
@end

這個方法每次執行的時間並不是嚴格的1秒鐘，列印時間戳上有細微的誤差，不過很難感覺出來，影響不大

dispatch_after(dispatch_time(dispatch_time_now, (int64_t)(1 * nsec_per_sec)), dispatch_get_main_queue(), ^);

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