如何使用iOS仿抖音視頻加載動(dòng)畫(huà)效果

小編給大家分享一下如何使用iOS仿抖音視頻加載動(dòng)畫(huà)效果，相信大部分人都還不怎么了解，因此分享這篇文章給大家參考一下，希望大家閱讀完這篇文章后大有收獲，下面讓我們一起去了解一下吧！

實(shí)現(xiàn)原理

首先我創(chuàng)建一個(gè)視圖

@interface ViewController ()@property (nonatomic, strong) UIView *playLoadingView;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; //init player status bar self.playLoadingView = [[UIView alloc]init]; self.playLoadingView.backgroundColor = [UIColor whiteColor]; [self.playLoadingView setHidden:YES]; [self.view addSubview:self.playLoadingView]; //make constraintes [self.playLoadingView mas_makeConstraints:^(MASConstraintMaker *make) { make.center.equalTo(self.view); make.width.mas_equalTo(1.0f); //寬 1 dp make.height.mas_equalTo(0.5f); //高 0.5 dp }]; [self startLoadingPlayAnimation:YES]; //調(diào)用動(dòng)畫(huà)代碼}

這里我們可以看到 我們實(shí)際上創(chuàng)建的是一個(gè) 1pt寬度 0.5 pt的寬度 的視圖

緊接著動(dòng)畫(huà)實(shí)現(xiàn)的代碼

- (void)startLoadingPlayAnimation:(BOOL)isStart { if (isStart) { self.playLoadingView.backgroundColor = [UIColor whiteColor]; self.playLoadingView.hidden = NO; [self.playLoadingView.layer removeAllAnimations]; CAAnimationGroup *animationGroup = [[CAAnimationGroup alloc] init]; animationGroup.duration = 0.5; animationGroup.beginTime = CACurrentMediaTime() + 0.5; animationGroup.repeatCount = MAXFLOAT; animationGroup.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; CABasicAnimation *scaleAnimation = [CABasicAnimation animation]; scaleAnimation.keyPath = @"transform.scale.x"; scaleAnimation.fromValue = @(1.0f); scaleAnimation.toValue = @(1.0f * ScreenWidth); CABasicAnimation *alphaAnimation = [CABasicAnimation animation]; alphaAnimation.keyPath = @"opacity"; alphaAnimation.fromValue = @(1.0f); alphaAnimation.toValue = @(0.5f); [animationGroup setAnimations:@[scaleAnimation, alphaAnimation]]; [self.playLoadingView.layer addAnimation:animationGroup forKey:nil]; } else { [self.playLoadingView.layer removeAllAnimations]; self.playLoadingView.hidden = YES; }}

完事 就這幾行代碼 搞定

其實(shí)核心的只有4行代碼

CABasicAnimation *scaleAnimation = [CABasicAnimation animation];scaleAnimation.keyPath = @"transform.scale.x";scaleAnimation.fromValue = @(1.0f);scaleAnimation.toValue = @(1.0f * ScreenWidth);

關(guān)鍵在scaleAnimation.keyPath = @"transform.scale.x"; 這里我們要沿著x做縮放

縮放的得值從 1~屏幕寬度, 當(dāng)然值多大自己可以控制.

如果@"transform.scale.y" 則是沿著Y軸縮放

當(dāng)然 如果寫(xiě)成@"transform.scale" 那就X,Y 一起縮放 大家可以試試.

以上是“如何使用iOS仿抖音視頻加載動(dòng)畫(huà)效果”這篇文章的所有內(nèi)容，感謝各位的閱讀！相信大家都有了一定的了解，希望分享的內(nèi)容對(duì)大家有所幫助，如果還想學(xué)習(xí)更多知識(shí)，歡迎關(guān)注億速云行業(yè)資訊頻道！