IOS等待时动画效果的实现

2020-07-26 03:34:47

字体：大中小

来源：转载

供稿：网友

查询时间或长或短，为了提升用户体验，目前用的比较多的手段之一就是查询等待时添加一个动态等待效果。当我们在请求网络时加载页面时有个动作效果，效果图如下：

源代码可以网上找开源项目Coding.net，上面的效果原理为两张图片组合，外面那个则为动画转动，里面的图标则是透明度的变化；主要代码如下：

1：把它封装在EaseLoadingView里面

@interface EaseLoadingView : UIView@property (strong, nonatomic) UIImageView *loopView, *monkeyView;@property (assign, nonatomic, readonly) BOOL isLoading;- (void)startAnimating;- (void)stopAnimating;@end@interface EaseLoadingView ()@property (nonatomic, assign) CGFloat loopAngle, monkeyAlpha, angleStep, alphaStep;@end@implementation EaseLoadingView- (instancetype)initWithFrame:(CGRect)frame{ self = [super initWithFrame:frame]; if (self) {  self.backgroundColor = [UIColor clearColor];  _loopView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"loading_loop"]];  _monkeyView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"loading_monkey"]];  [_loopView setCenter:self.center];  [_monkeyView setCenter:self.center];  [self addSubview:_loopView];  [self addSubview:_monkeyView];  [_loopView mas_makeConstraints:^(MASConstraintMaker *make) {   make.center.equalTo(self);  }];  [_monkeyView mas_makeConstraints:^(MASConstraintMaker *make) {   make.center.equalTo(self);  }];  _loopAngle = 0.0;  _monkeyAlpha = 1.0;  _angleStep = 360/3;  _alphaStep = 1.0/3.0; } return self;}- (void)startAnimating{ self.hidden = NO; if (_isLoading) {  return; } _isLoading = YES; [self loadingAnimation];}- (void)stopAnimating{ self.hidden = YES; _isLoading = NO;}- (void)loadingAnimation{ static CGFloat duration = 0.25f; _loopAngle += _angleStep; if (_monkeyAlpha >= 1.0 || _monkeyAlpha <= 0.0) {  _alphaStep = -_alphaStep; } _monkeyAlpha += _alphaStep; [UIView animateWithDuration:duration delay:0.0 options:UIViewAnimationOptionCurveLinear animations:^{  CGAffineTransform loopAngleTransform = CGAffineTransformMakeRotation(_loopAngle * (M_PI / 180.0f));  _loopView.transform = loopAngleTransform;  _monkeyView.alpha = _monkeyAlpha; } completion:^(BOOL finished) {  if (_isLoading && [self superview] != nil) {   [self loadingAnimation];  }else{   [self removeFromSuperview];   _loopAngle = 0.0;   _monkeyAlpha = 1,0;   _alphaStep = ABS(_alphaStep);   CGAffineTransform loopAngleTransform = CGAffineTransformMakeRotation(_loopAngle * (M_PI / 180.0f));   _loopView.transform = loopAngleTransform;   _monkeyView.alpha = _monkeyAlpha;  } }];}@end

注意loadingAnimation这里面有动作的处理及透明度的处理，当停止加载后把它自个从当前的视图去除；

2：UIView (Common)在UIView扩展类里

#pragma mark LoadingView@property (strong, nonatomic) EaseLoadingView *loadingView;- (void)beginLoading;- (void)endLoading;@end- (void)setLoadingView:(EaseLoadingView *)loadingView{ [self willChangeValueForKey:@"LoadingViewKey"]; objc_setAssociatedObject(self, &LoadingViewKey,        loadingView,        OBJC_ASSOCIATION_RETAIN_NONATOMIC); [self didChangeValueForKey:@"LoadingViewKey"];}- (EaseLoadingView *)loadingView{ return objc_getAssociatedObject(self, &LoadingViewKey);}- (void)beginLoading{ for (UIView *aView in [self.blankPageContainer subviews]) {  if ([aView isKindOfClass:[EaseBlankPageView class]] && !aView.hidden) {   return;  } } if (!self.loadingView) { //初始化LoadingView  self.loadingView = [[EaseLoadingView alloc] initWithFrame:self.bounds]; } [self addSubview:self.loadingView]; [self.loadingView mas_makeConstraints:^(MASConstraintMaker *make) {  make.self.edges.equalTo(self); }]; [self.loadingView startAnimating];}- (void)endLoading{ if (self.loadingView) {  [self.loadingView stopAnimating]; }}

注意：cocoa的KVO模型中，有两种通知观察者的方式，自动通知和手动通知。顾名思义，自动通知由cocoa在属性值变化时自动通知观察者，而手动通知需要在值变化时调用 willChangeValueForKey:和didChangeValueForKey: 方法通知调用者。

3：使用页面调用

- (void)sendRequest{ [self.view beginLoading]; __weak typeof(self) weakSelf = self; [[Coding_NetAPIManager sharedManager] request_CodeFile:_myCodeFile withPro:_myProject andBlock:^(id data, NSError *error) {  [weakSelf.view endLoading];  if (data) {   weakSelf.myCodeFile = data;   [weakSelf refreshCodeViewData];  }  [weakSelf.view configBlankPage:EaseBlankPageTypeView hasData:(data != nil) hasError:(error != nil) reloadButtonBlock:^(id sender) {   [weakSelf sendRequest];  }]; }];}

其中[self.view beginLoading]跟[weakSelf.view endLoading]就可以调用动画效果；

补充：另一种是有很多不同的图片组成的动画效果，可以用每一张图片然后FOR遍历组成出动作效果；

//设置普通状态的动画图片 NSMutableArray *idleImages = [NSMutableArray array]; for (NSUInteger i = 1; i<=60; ++i) {    UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"dropdown_anim__000%zd",i]];    [idleImages addObject:image];  [idleImages addObject:image]; }

以上内容是本文通过IOS等待时动画效果的实现，希望对大家有所帮助。

上一篇：ios百度地图的使用（普通定位、反地理编码）

下一篇：IOS给图片添加水印（两种方式）