UINavigationController, UIViewController, UITabBarController, every VC can add this View.
开门见山，先看效果图
WHDropDownView 动画
说说动画实现和难点吧。UI分为两部分：
- indicatorView（boomup，waggle）
- contentView（拖动动画）
boomup动画
boomup是3个简单动画叠加的：
- 蓝色半透明底的 transform.scale 从 0.0 到1.0
self.image = [UIImage imageNamed:@"sparkle.png"];
self.transform = CGAffineTransformMakeScale(0.0, 0.0);
[UIView animateWithDuration:0.25
delay:0
usingSpringWithDamping:1
initialSpringVelocity:10
options:0
animations:^{
self.transform = CGAffineTransformMakeScale(1.0, 1.0);
}
completion:^(BOOL finished) {
self.image = nil;
}];
- icon 外圈环等角度7个大点和小点
[self popOutsideWithDuration];
CGFloat radius = self.iconImageView.bounds.size.height*1.3/2; // ring radius
CGFloat igniteFromRadius = radius*0.4;
CGFloat igniteToRadius = radius*0.7;
NSArray *sparks = [self createSparks:igniteFromRadius];
for (TTSpark *spark in sparks) {
[spark animateIgniteShow:igniteToRadius duration:1.0 delay:0.05];
[spark animateIgniteHide:0.8 delay:0.2];
}
- icon 的 transform.scale 从 0.0 到1.0
self.iconImageView.transform = CGAffineTransformMakeScale(0.0, 0.0);
[UIView animateWithDuration:0.35
delay:0.25
usingSpringWithDamping:1
initialSpringVelocity:10
options:0
animations:^{
self.iconImageView.transform = CGAffineTransformMakeScale(1.0, 1.0);
}
completion:nil];
代码略多，在此就不粘全了。
出现场景：
- 每次切换到这个VC
- 第一次进入这个VC
waggle动画
- icon 的3D左翻转 ，3次
[UIView animateWithDuration:0.5f delay:0.1 options:UIViewAnimationOptionTransitionNone animations:^{
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self cache:YES];
self.iconImageView.image = [UIImage imageNamed:newOne];
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.5f delay:0.2 options:UIViewAnimationOptionTransitionNone animations:^{
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self cache:YES];
self.iconImageView.image = [UIImage imageNamed:lastOne];
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.5f delay:0.2 options:UIViewAnimationOptionTransitionNone animations:^{
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self cache:YES];
self.iconImageView.image = [UIImage imageNamed:newOne];
} completion:^(BOOL finished) {
}];
}];
}];
- 整个indicator的Z轴旋转
CGFloat fromRotation = 0;
CGFloat byRotation = 0.06;
CGFloat toRotation = -0.06;
CAKeyframeAnimation *circleTransform = [CAKeyframeAnimation animationWithKeyPath:@"transform"];
circleTransform.duration = 5;
circleTransform.repeatCount = 1;
circleTransform.autoreverses = NO;
circleTransform.values = @[
[NSValue valueWithCATransform3D:CATransform3DRotate(self.layer.transform, fromRotation, 0.0, 0.0, 1.0)],
[NSValue valueWithCATransform3D:CATransform3DRotate(self.layer.transform, byRotation, 0.0, 0.0, 1.0)],
[NSValue valueWithCATransform3D:CATransform3DRotate(self.layer.transform, fromRotation, 0.0, 0.0, 1.0)],
[NSValue valueWithCATransform3D:CATransform3DRotate(self.layer.transform, toRotation, 0.0, 0.0, 1.0)],
[NSValue valueWithCATransform3D:CATransform3DRotate(self.layer.transform, fromRotation, 0.0, 0.0, 1.0)],
[NSValue valueWithCATransform3D:CATransform3DRotate(self.layer.transform, byRotation/2, 0.0, 0.0, 1.0)],
[NSValue valueWithCATransform3D:CATransform3DRotate(self.layer.transform, fromRotation, 0.0, 0.0, 1.0)],
[NSValue valueWithCATransform3D:CATransform3DRotate(self.layer.transform, toRotation/2, 0.0, 0.0, 1.0)],
[NSValue valueWithCATransform3D:CATransform3DRotate(self.layer.transform, fromRotation, 0.0, 0.0, 1.0)],
[NSValue valueWithCATransform3D:CATransform3DRotate(self.layer.transform, fromRotation, 0.0, 0.0, 1.0)],
[NSValue valueWithCATransform3D:CATransform3DRotate(self.layer.transform, fromRotation, 0.0, 0.0, 1.0)],
];
[self.layer addAnimation:circleTransform forKey:@"shakeAnimation"];
- 整个indicator的Y轴拉伸
CAKeyframeAnimation *scaleY = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale.y"];
scaleY.values = @[@1.0, @1.04, @1.01, @1.04, @1.01, @1.04, @1.02, @1.04, @1.01, @1.02, @1.0];
scaleY.autoreverses = NO;
scaleY.duration= 5;
scaleY.repeatCount = 1;
[self.layer addAnimation:scaleY forKey:@"scaleY"];
出现场景：
- 每隔15秒静止（无下拉等用户操作）就waggle一下
- 下拉内容页隐藏的时候
####拖动动画 下拉回退有两种行为，点击/拖动。分别是用
- UITapGestureRecognizer
- UIPanGestureRecognizer
WHDropDownView 接入说明
无论是 UINavigationController, UIViewController, UITabBarController 都能完美嵌入，界面右上角悬挂绳索饰品，下拉点击就出内容页。
- 接入只需要一句代码，在要展示的 VC 的 viewDidLoad 调用
//传入UINavigationController, UIViewController, UITabBarController, 的View
- (void)showDropDownViewOn:(UIView *)bottomView;
- 在你认为合适的时机调用 boomup 动画（比如viewDidAppear:）
//WHDropDownView.h
@interface WHDropDownView : UIView
+ (WHDropDownView *)sharedInstance;
//传入UINavigationController, UIViewController, UITabBarController, 的View
- (void)showDropDownViewOn:(UIView *)bottomView;
- (void)boomup;
@end
- 下拉内容页 WHDropDownContentView，你可以自定义里面cell的样式和填充内容
- icon 图目前使用的本地图，有需求建议改成线上可配
- 3r-party：Masonry ，非必需，可以改成任何布局框架，代码也不多