SourceCode

Demo

本篇是DSAnimation系列的第一篇，之前两个月一直在做Hybrid开发和server开发方面的工作，通过这个主题巩固一下ios方面的知识

demo.gif

这个自定义的SwitchButton有两个特点：

• 开关状态切换时Thumb有一个bounce的效果
• 开关状态切换时添加Ripple效果

bounce effect

//switch movement animation
- (void)changeThumbStateONwithAnimation {
    [UIView animateWithDuration:0.15f
                          delay:0.05f
                        options:UIViewAnimationOptionCurveEaseOut
                     animations:^{
                         CGRect thumbFrame = self.switchThumb.frame;
                         thumbFrame.origin.x = self.thumbOnPosition +  3.0f;
                         self.switchThumb.frame = thumbFrame;
                         self.switchThumb.backgroundColor = self.OnColor;
                         self.track.backgroundColor = self.TrackOnColor;
                         self.userInteractionEnabled = NO;

                     }completion:^(BOOL finished){
                         if (self.isOn == NO){
                             self.isOn = YES;
                             [self sendActionsForControlEvents:UIControlEventValueChanged];
                         }
                         
                         self.isOn = YES;
                         [UIView animateWithDuration:0.15f
                                          animations:^{
                                              CGRect thumbFrame = self.switchThumb.frame;
                                              thumbFrame.origin.x = self.thumbOnPosition;
                                              self.switchThumb.frame = thumbFrame;
                                          }completion:^(BOOL finished){
                                              self.userInteractionEnabled = YES;
                                          }];
                     }];
}

ripple effect

//initialize ripple effect
- (void)initializeRipple {
    
    self.rippleLayer = [CAShapeLayer layer];
    float rippleScale = 2;
    CGRect rippleFrame = CGRectZero;
    rippleFrame.origin.x = -self.switchThumb.frame.size.width / (rippleScale * 2);
    rippleFrame.origin.y = -self.switchThumb.frame.size.height / (rippleScale * 2);
    rippleFrame.size.width = self.switchThumb.frame.size.width * rippleScale;
    rippleFrame.size.height = rippleFrame.size.width;
    
    UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:rippleFrame cornerRadius:self.switchThumb.layer.cornerRadius*2];
    self.rippleLayer.path = path.CGPath;
    self.rippleLayer.frame = rippleFrame;
    self.rippleLayer.opacity = 0.2;
    self.rippleLayer.strokeColor = [UIColor clearColor].CGColor;
    self.rippleLayer.fillColor = self.RippleColor.CGColor;
    self.rippleLayer.lineWidth = 0;
    
    [self.switchThumb.layer insertSublayer:self.rippleLayer below:self.switchThumb.layer];
    
}

有关UIBezierPath, CABasicAnimation请查阅8.1 属性动画

// implement ripple effect
- (void)animateRippleEffect {
    if (self.rippleLayer == nil){
        [self initializeRipple];
    }
    
    // begain animation
    self.rippleLayer.opacity = 0.0;
    [CATransaction begin];
    
    // remove animation
    [CATransaction setCompletionBlock:^{
        [self.rippleLayer removeFromSuperlayer];
        self.rippleLayer = nil;
    }];
    
    //scale ripple
    CABasicAnimation *scaleAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    scaleAnimation.fromValue = [NSNumber numberWithFloat:0.5];
    scaleAnimation.toValue = [NSNumber numberWithFloat:1.25];
    
    CABasicAnimation *alphaAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
    alphaAnimation.fromValue = @0.4;
    alphaAnimation.toValue = @0;
    
    // group animation
    CAAnimationGroup *animation = [CAAnimationGroup animation];
    animation.animations = @[scaleAnimation , alphaAnimation];
    animation.duration = 0.4f;
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
    [self.rippleLayer addAnimation:animation forKey:nil];
    [CATransaction commit];
}