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66 lines
2.0 KiB
Markdown
66 lines
2.0 KiB
Markdown
# 仿微博弹簧动画
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> 老玩微博，最近在研究动画，周末抽空写了个发微博的动画
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# 实现步骤
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- 首先模打出一个控制器
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- 这个控制器用来显示多个按钮。（按钮是图文上下排列的，所以我们需要自定义按钮的布局样式）
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- 动画思路：先在界面添加好几个 UIButton，之后给每个 button 添加**y**方向的平移动画 -> 设置一个定时器，每次执行的时候依次取出按钮，将按钮添加一个弹簧动画（**usingSpringWithDamping **）将形变动画恢复原位
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- 给按钮添加2种事件（按下的事件、点击后抬起的事件）
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## 关键代码
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```
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//开始时让所有按钮都移动到最底部
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btn.transform = CGAffineTransformMakeTranslation(0, self.view.bounds.size.height);
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//添加定时器
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self.timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(update) userInfo:nil repeats:YES];
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- (void)update{
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if (self.btnIndex == self.btnArray.count) {
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[self.timer invalidate];
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return ;
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}
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VerticalStyleButton *button = self.btnArray[self.btnIndex];
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//弹簧动画
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[UIView animateWithDuration:0.3 delay:0.2 usingSpringWithDamping:0.8 initialSpringVelocity:0 options:UIViewAnimationOptionCurveLinear animations:^{
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button.transform = CGAffineTransformIdentity;
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} completion:^(BOOL finished) {
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}];
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self.btnIndex++;
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}
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- (void)btnClick:(UIButton *)button{
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[UIView animateWithDuration:0.25 animations:^{
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button.transform = CGAffineTransformMakeScale(1.2, 1.2);
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}];
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}
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- (void)btnClick1:(UIButton *)button{
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[UIView animateWithDuration:0.25 animations:^{
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button.alpha = 0;
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button.transform = CGAffineTransformMakeScale(2, 2);
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}];
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}
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```
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# 效果图
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[源码地址](https://github.com/FantasticLBP/BlogDemos/tree/master/微博发帖动画)
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