How to programmatically rotate image by 90 Degrees in iPhone? [duplicate]

问题

Possible Duplicate:
How to Rotate a UIImage 90 degrees?

How to programmatically rotate image by 90 Degrees in iPhone?

回答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

回答2:

see this:

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

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

回答3:

this code will rotate the button..

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];

same way u can rotate imageview.

来源：https://stackoverflow.com/questions/5581241/how-to-programmatically-rotate-image-by-90-degrees-in-iphone

标签

iphone