怎样实现UIView的旋转
首先创建界面，在viewDidLoad创建view以及button
相关代码如下
-(void)viewDidLoad
{
[super viewDidLoad];
viewDemo = [[UIView alloc] initWithFrame:CGRectMake(0, 50, 320, 50)];
[viewDemo setBackgroundColor:[UIColor brownColor]];
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 100, 50)];
label.text =@"Test";
label.tag=100;
[viewDemo addSubview:label];
[self.view addSubview:viewDemo];
[label release];
// Do any additional setup after loading the view, typically from a nib.
UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(0, 400, 100, 50)];
[btn setBackgroundColor:[UIColor blueColor]];
btn.showsTouchWhenHighlighted = YES;
[btn setTitle:@"点击旋转" forState:UIControlStateNormal];
[self.view addSubview:btn];
btn.tag = 10010;
[btn addTarget:self action:@selector(testViewDemo) forControlEvents:UIControlEventTouchUpInside];
[btn release];
number = 0;
}
-(void)testViewDemo
{
number++;
if (number%3 == 0) {
CGAffineTransform at = CGAffineTransformMakeRotation(M_PI/2);
at = CGAffineTransformTranslate(at, 200, 0);
[viewDemo setTransform:at];
}else if (number%3 ==1 ){
CGAffineTransform at = CGAffineTransformMakeRotation(M_PI/1);
at = CGAffineTransformTranslate(at, 0, 0);
[viewDemo setTransform:at];
}else if(number%3 ==2){
CGAffineTransform at = CGAffineTransformMakeRotation(M_PI*2);
at = CGAffineTransformTranslate(at, 0, 0);
[viewDemo setTransform:at];
}
}
-(void)testViewDemo
{
//旋转,左旋
number++;
CGAffineTransform rotate = CGAffineTransformMakeRotation(number / 180.0 * M_PI );
[viewDemo setTransform:rotate];
}
如果使用此方法连续点击button就可以显示处一点一点的移动效果
每次旋转90度的话可以使用一下的代码实现效果
-(void)testViewDemo
{
//旋转,右旋
number = number+90.0;
CGAffineTransform rotate = CGAffineTransformMakeRotation(number / 180.0 * M_PI );
[viewDemo setTransform:rotate];
｝
UIView实现左旋效果
//旋转,左旋
number = number-90.0;
CGAffineTransform rotate = CGAffineTransformMakeRotation(number / 180.0 * M_PI );
[viewDemo setTransform:rotate];
通过以上的讲解，我想，关于点击UIButton实现UIView的旋转大家就可以轻松的操作了。
传送门：
http://jingyan.baidu.com/article/3aed632e7164b070108091de.html
