如何在iPhone上通过编程将图像旋转90度?
可能是重复问题:
如何将UIImage旋转90度?
//create rect
UIImageView *myImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"my_image.png"]];
//set point of rotation
myImageView.center = CGPointMake(100.0, 100.0);
//rotate rect
myImageView.transform = CGAffineTransformMakeRotation(M_PI_2); //rotation in radians
看这个:
如何在Quartz中旋转图片?图片是倒置的!(iPhone)
myImage.center = CGPointMake(0, 0);
myImage.transform = CGAffineTransformMakeRotation([degreesToRadians:imageRotationFix]);
这段代码将旋转按钮..
UIButton *btn=[UIButton buttonWithType:UIButtonTypeRoundedRect];
[btn setFrame:CGRectMake(100, 100, 200, 44)];
btn.transform=CGAffineTransformMakeRotation(M_PI / -4);
[btn setTitle:@"RakeshBhatt" forState:UIControlStateNormal];
[self.view addSubview:btn];
同样的方法,您可以旋转ImageView。
M_PI
代替3.14159265
,使用M_PI_2
代替M_PI/2
。 - Matoe