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[操作系统]等待时动画效果的实现


当我们在请求网络时加载页面时有个动作效果,效果如下:

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];  }