1 制作简易三个球的旋转动画，效果如下：
思路：三个UIView + 一个Window + UIVisualEffectView，测试下下，好久没练习动画这块；
@interface TJTestLoadingHUD : UIVisualEffectView
+(void)showHUD;
+(void)dismissHUD;
@end
@implementation TJTestLoadingHUD{
UIView *ball_1;
UIView *ball_2;
UIView *ball_3;
}
+(TJTestLoadingHUD *)sharedHUD{
static dispatch_once_t onceToken;
static TJTestLoadingHUD *sharedHUD;
dispatch_once(&onceToken, ^{
sharedHUD = [[self alloc] initWithEffect:[UIBlurEffect effectWithStyle:UIBlurEffectStyleDark]];
//UIBlurEffectStyleExtraLight UIBlurEffectStyleDark
});
return sharedHUD;
}
-(instancetype)initWithEffect:(UIVisualEffect *)effect{
if (self = [super initWithEffect:effect]) {
self.frame = [UIScreen mainScreen].bounds;
//创建三个圆球 并设置frame ball_2 位于中间
ball_2 = [[UIView alloc]initWithFrame:CGRectMake(WIDTH/2 - BALL_RADIUS/2, HEIGHT/2 -BALL_RADIUS /2, BALL_RADIUS, BALL_RADIUS)];
ball_2.backgroundColor = [UIColor whiteColor];
ball_2.layer.cornerRadius = ball_2.bounds.size.width/2.0;
ball_1 = [[UIView alloc] initWithFrame:CGRectMake(ball_2.frame.origin.x - BALL_RADIUS, ball_2.frame.origin.y, BALL_RADIUS, BALL_RADIUS)];
ball_1.backgroundColor = [UIColor whiteColor];
ball_1.layer.cornerRadius = ball_1.bounds.size.width/2;
ball_3 = [[UIView alloc]initWithFrame:CGRectMake(ball_2.frame.origin.x + BALL_RADIUS, ball_2.frame.origin.y, BALL_RADIUS, BALL_RADIUS)];
ball_3.backgroundColor = [UIColor whiteColor];
ball_3.layer.cornerRadius = ball_3.bounds.size.width / 2;
[self addSubview:ball_1];
[self addSubview:ball_2];
[self addSubview:ball_3];
}
return self;
}
+(void)showHUD{
//UIView动态改变alpha值
TJTestLoadingHUD *hud = [TJTestLoadingHUD sharedHUD];
UIWindow *window = [UIApplication sharedApplication].keyWindow;
if (window != nil) {
hud.alpha = 0.0;
[window addSubview:hud]; //不完全为1，可以看见下面的View
[UIView animateWithDuration:0.25 animations:^{
hud.alpha = 0.9;
}completion:^(BOOL finished) {
hud.alpha = 0.9;
[hud startLoadingAnimation];
}];
}
}
//转球动画
-(void)startLoadingAnimation{
//创建动画路径
UIBezierPath *circlePath_1 = [UIBezierPath bezierPath];
[circlePath_1 moveToPoint:CGPointMake(WIDTH/2 -BALL_RADIUS, HEIGHT/2)];
//球1 动画路径
[circlePath_1 addArcWithCenter:CGPointMake(WIDTH/2, HEIGHT/2) radius:BALL_RADIUS startAngle:(180 * M_PI)/180 endAngle:(360 *M_PI)/180 clockwise:NO];
UIBezierPath *circlePath_1_2 = [UIBezierPath bezierPath];
[circlePath_1_2 addArcWithCenter:CGPointMake(WIDTH/2, HEIGHT/2) radius:BALL_RADIUS startAngle:0 endAngle:(180*M_PI)/180 clockwise:NO];
[circlePath_1 appendPath:circlePath_1_2];
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
animation.path = circlePath_1.CGPath;
animation.removedOnCompletion = YES;
animation.duration = 1.4;
animation.repeatCount = INFINITY;
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
[ball_1.layer addAnimation:animation forKey:@"animation"];
// ===2 球3 动画路径
UIBezierPath *circlePath_2 = [UIBezierPath bezierPath];
[circlePath_2 moveToPoint:CGPointMake(WIDTH/2 + BALL_RADIUS, HEIGHT/2)];
[circlePath_2 addArcWithCenter:CGPointMake(WIDTH/2, HEIGHT/2) radius:BALL_RADIUS startAngle:(0*M_PI)/180 endAngle:(180*M_PI)/180 clockwise:NO];
UIBezierPath *circlePath_2_2 = [UIBezierPath bezierPath];
[circlePath_2_2 addArcWithCenter:CGPointMake(WIDTH/2, HEIGHT/2) radius:BALL_RADIUS startAngle:(180 *M_PI)/180 endAngle:(360*M_PI)/180 clockwise:NO];
[circlePath_2 appendPath:circlePath_2_2];
CAKeyframeAnimation *animation_2 = [CAKeyframeAnimation animationWithKeyPath:@"position"];
animation_2.path = circlePath_2.CGPath;
animation_2.removedOnCompletion = YES;
animation_2.repeatCount = INFINITY;
animation_2.duration = 1.4 ;
animation_2.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
[ball_3.layer addAnimation:animation_2 forKey:@"Rotation"];
self.timer = [NSTimer scheduledTimerWithTimeInterval:0.7 target:self selector:@selector(scaleAnimation) userInfo:nil repeats:YES];
[[NSRunLoop mainRunLoop] addTimer:_timer forMode:NSRunLoopCommonModes];
}
//放大球 + 平移球
-(void)scaleAnimation{
[UIView animateWithDuration:0.3 delay:0.1 options:UIViewAnimationOptionCurveEaseOut | UIViewAnimationOptionBeginFromCurrentState animations:^{
ball_1.transform = CGAffineTransformMakeTranslation(-BALL_RADIUS, 0);
ball_1.transform = CGAffineTransformScale(ball_1.transform, 0.7, 0.7);
ball_3.transform = CGAffineTransformMakeTranslation(BALL_RADIUS, 0);
ball_3.transform = CGAffineTransformScale(ball_3.transform, 0.7, 0.7);
ball_2.transform = CGAffineTransformScale(ball_2.transform, 0.7, 0.7);
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.3 delay:0.0 options:UIViewAnimationOptionCurveEaseIn | UIViewAnimationOptionBeginFromCurrentState animations:^{
ball_1.transform = CGAffineTransformIdentity;
ball_3.transform = CGAffineTransformIdentity;
ball_2.transform = CGAffineTransformIdentity;
} completion:NULL];
}];
}
//隐藏hud
+(void)dismissHUD{
TJTestLoadingHUD *hud = [TJTestLoadingHUD sharedHUD];
[hud stopLoadingAnimation];
[hud.timer invalidate];
[UIView animateWithDuration:0.3 animations:^{
hud.alpha = 0;
} completion:^(BOOL finished) {
[hud removeFromSuperview];
}];
}
//停止动画
-(void)stopLoadingAnimation {
[ball_1.layer removeAllAnimations];
[ball_2.layer removeAllAnimations];
[ball_3.layer removeAllAnimations];
}
另外，在拓展里面，声明了一个NSTimer 的时间；涌来执行球的放大和平移;关于UIVisualEffectView，这是iOS 8推出的一种制作遮罩的View；有兴趣可以 打开Xcode->window->Documentation And API reference 搜索 UIVisualEffectView，看看！
