IOS等待時動畫效果的實現_IOS

查詢時間或長或短，為了提升使用者體驗，目前用的比較多的手段之一就是查詢等待時添加一個動態等待效果。當我們在請求網路時載入頁面時有個動作效果，效果圖如下：

原始碼可以網上找開源項目Coding.net，上面的效果原理為兩張圖片組合，外面那個則為動畫轉動，裡面的表徵圖則是透明度的變化；主要代碼如下：

1：把它封裝在EaseLoadingView裡面

@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這裡面有動作的處理及透明度的處理，當停止載入後把它自個從當前的視圖去除；

2：UIView (Common)在UIView擴充類裡

#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，有兩種通知觀察者的方式，自動通知和手動通知。顧名思義，自動通知由cocoa在屬性值變化時自動通知觀察者，而手動通知需要在值變化時調用 willChangeValueForKey:和didChangeValueForKey: 方法通知調用者。

3：使用頁面調用

- (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]就可以調用動畫效果；

補充：另一種是有很多不同的圖片組成的動畫效果，可以用每一張圖片然後FOR遍曆組成出動作效果；

//設定普通狀態的動畫圖片 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]; }

以上內容是本文通過IOS等待時動畫效果的實現，希望對大家有所協助。