어떻게 UIImage 회전하지만 가장자리를 자르면 안돼 IOS

Question

도움말, ios 프로그래밍에 새로운, 회전 할 수 있습니다 UIImage 수 있지만 가장자리를 잘라내거나 이미지 일부를 느슨하게 싶지 않아요. 이미지가 회전하지만, 프레임의 크기 때문에 이미지의 일부를 변경하지 않습니다

double angle = M_PI * 10/ 180; CGSize s = {image.size.width, image.size.height}; UIGraphicsBeginImageContext(s); CGContextRef ctx = UIGraphicsGetCurrentContext(); 

CGAffineTransform transform = CGAffineTransformIdentity; 
transform = CGAffineTransformTranslate(transform, image.size.width/2, image.size.height/2); 

transform = CGAffineTransformRotate(transform, angle); 
transform = CGAffineTransformScale(transform, 1.0, -1.0); 

CGContextConcatCTM(ctx, transform); 

CGContextDrawImage(ctx,CGRectMake(-[image size].width/2,-[image size].height/2,image.size.width, image.size.height),image.CGImage); 
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); 
UIGraphicsEndImageContext(); 

UIImageWriteToSavedPhotosAlbum(newImage, nil, nil, nil); 

가 절단되었습니다

이

내 코드입니다.

출력 : https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-xpf1/t1.0-9/1555286_761679470521535_1800180000235265553_n.jpg

예상 출력 : https://fbcdn-photos-g-a.akamaihd.net/hphotos-ak-xfa1/t1.0-0/10314770_761675840521898_6536715783383115855_a.jpg

내가 당신을 감사 도와주세요.

Answer 1

검색하신 내용 일 수도 있습니다.

.m 파일 (@end 다음)의 끝에 이미지를 회전하려는 다음 코드를 복사하기 만하면됩니다.

@interface UIImage (RotationMethods) 
- (UIImage *)imageRotatedByDegrees:(CGFloat)degrees; 
@end 

@implementation UIImage (RotationMethods) 

static CGFloat DegreesToRadians(CGFloat degrees) {return degrees * M_PI/180;}; 

- (UIImage *)imageRotatedByDegrees:(CGFloat)degrees 
{ 
    // calculate the size of the rotated view's containing box for our drawing space 
    UIView *rotatedViewBox = [[UIView alloc] initWithFrame:CGRectMake(0,0,self.size.width, self.size.height)]; 
    CGAffineTransform t = CGAffineTransformMakeRotation(DegreesToRadians(degrees)); 
    rotatedViewBox.transform = t; 
    CGSize rotatedSize = rotatedViewBox.frame.size; 

    // Create the bitmap context 
    UIGraphicsBeginImageContext(rotatedSize); 
    CGContextRef bitmap = UIGraphicsGetCurrentContext(); 

    // Move the origin to the middle of the image so we will rotate and scale around the center. 
    CGContextTranslateCTM(bitmap, rotatedSize.width/2, rotatedSize.height/2); 

    // // Rotate the image context 
    CGContextRotateCTM(bitmap, DegreesToRadians(degrees)); 

    // Now, draw the rotated/scaled image into the context 
    CGContextScaleCTM(bitmap, 1.0, -1.0); 
    CGContextDrawImage(bitmap, CGRectMake(-self.size.width/2, -self.size.height/2, self.size.width, self.size.height), [self CGImage]); 

    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); 
    UIGraphicsEndImageContext(); 
    return newImage; 

} 

그런 다음 아래의 예처럼 이미지를 회전 :

CGFloat degrees = 90; 
yourImage = [yourImage imageRotatedByDegrees:degrees];