动画开发
一、 UIImageView来播放图片组成帧动画
1.创建UIImageView
UIImageView * imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 30, 30)];
//必须设置.frame的值才能正确显示
2.创建对象数组
NSMutableArray * imageArr = [[NSMutableArray alloc]init];
for (int i = 1 ; i <= 4 ; i ++){ //循环设置对象数组的值
UIImage * image = [UIImage imageNamed:[NSString stringWithFormat:@"%d.png",i]];
[imageArr addObject:image];
}
[imageView setAnimationImages:imageArr]; //将对象数组设置为imageView的动画数组
3.设置播放参数
[imageView setAnimationDuration:2]; //播放时长：2秒
[imageView setAnimationRepeatCount:0]; //播放重复次数：0为无限循环
[imageView startAnimating]; //设置开始播放
[imageView stopAnimating]; //设置停止播放
二、UIVIew层的动画
1.创建色块
@interface ViewController (){
UIView * colorView;
}
colorView = [[UIView alloc]initWithFrame:CGRectMake(100, 100, 50, 50)];
[colorView setBackgroundColor:[UIColor redColor]];
[colorView.layer setMasksToBounds:YES];
[colorView.layer setCornerRadius:50/2];
[self.view addSubview:colorView];
2.几种创建方法
（一）直接创建
[UIView animateWithDuration:2 animations:^{
[colorView setFrame:CGRectMake(100, 300, 50, 50)];
}];
（二）带完成方法的创建
[UIView animateWithDuration:2 animations:^{
[colorView setBackgroundColor:[UIColor blueColor]];
}completion:^(BOOL finished) {
[UIView animateWithDuration:2 animations:^{
[colorView.layer setCornerRadius:0];
}];
}];
//可在完成方法中嵌套
（三）带完成方法、延迟和动画的配置参数的创建
[UIView animateWithDuration:2 delay:1 options:UIViewAnimationOptionCurveEaseInOut animations:^{
[colorView setFrame:CGRectMake(100, 100, 50, 50)];
[colorView.layer setCornerRadius:50/20];
} completion:nil];
（四）带阻尼系数的创建
[UIView animateWithDuration:2 delay:1 usingSpringWithDamping:1 initialSpringVelocity:10 options:UIViewAnimationOptionCurveEaseInOut animations:^{nil} completion:nil];
//usingSpringWithDamping:阻尼系数，取值为0～1，越接近1
