如何以编程方式在iPhone中将图像旋转90度？

Question

  

可能重复：
  How to Rotate a UIImage 90 degrees?

如何以编程方式在iPhone中将图像旋转90度？

Answer 1

//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

Answer 2

看到这个：

Rotate image in Quartz? Image is upside down! (iPhone)

 myImage.center = CGPointMake(0, 0);
 myImage.transform = CGAffineTransformMakeRotation([degreesToRadians:imageRotationFix]);

Answer 3

此代码将旋转按钮..

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];

你可以旋转imageview。