iOS Dev (28) 三种基本的 2D 放射变换

iOS Dev (28) 三种基本的 2D 放射变换

作者：CSDN 大锐哥
地址：http://blog.csdn.net/prevention

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基础

我们要用到的是：

CGAffineTransform

的一些函数（是 C 形式的函数）。
缩放 scale 的定义：

CGAffineTransform CGAffineTransformScale (
CGAffineTransform t,
CGFloat sx,
CGFloat sy
);

旋转 roate 的定义：

CGAffineTransform CGAffineTransformRotate (
CGAffineTransform t,
CGFloat angle
);

平移 translate 的定义：

CGAffineTransform CGAffineTransformTranslate (
CGAffineTransform t,
CGFloat tx,
CGFloat ty
);

示例

建立一个 Empty Project，直接该丫的 application 方法。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(60, 100, 200, 200)];
view1.tag = 101;
view1.backgroundColor = [UIColor redColor];
[self.window addSubview:view1];

UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(50, 50, 100, 100)];
view2.tag = 102;
view2.backgroundColor = [UIColor yellowColor];
[view1 addSubview:view2];

UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(110, 400, 100, 44)];
btn.backgroundColor = [UIColor cyanColor];
[btn addTarget:self action:@selector(onClick) forControlEvents:UIControlEventTouchUpInside];
[self.window addSubview:btn];

self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}

- (void)onClick
{
UIView *view2 = [[self.window viewWithTag:101] viewWithTag:102];
view2.transform = CGAffineTransformScale(view2.transform, 0.8, 0.8);
view2.transform = CGAffineTransformRotate(view2.transform, 0.2);
view2.transform = CGAffineTransformTranslate(view2.transform, 50, 50);
}

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