Я пытаюсь создать гибкую рамку для моего приложения для iPhone с небольшими картинками. CustomView наследует UIView и переопределяет его setFrame:
метод. В setFrame: я пытаюсь вызвать [self setNeedsDisplay];
Каждый раз, когда я масштабирую фотографию, этот кадр действительно отображается и изменяется, но что-то работает не очень хорошо. Код и эффект ниже:
// повернуть, чтобы получить зеркальное отображение originImage, а isHorization означает направление вращения
- (UIImage *) fetchMirrorImage: (UIImage *) originImage Направление: (BOOL) isHorization {
CGSize imageSize = originImage.size;
UIGraphicsBeginImageContext (IMAGESIZE);
CGContextRef context = UIGraphicsGetCurrentContext ();
CGAffineTransform transform = CGAffineTransformIdentity;
if (isHorization) {
transform = CGAffineTransformMakeTranslation(imageSize.width, 0.0);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
}else {
transform = CGAffineTransformMakeTranslation(0.0, imageSize.height);
transform = CGAffineTransformScale(transform, 1.0, -1.0);
}
CGContextScaleCTM(context, 1, -1);
CGContextTranslateCTM(context, 0, -imageSize.height);
CGContextConcatCTM(context, transform);
CGContextDrawImage(context, CGRectMake(0, 0, imageSize.width, imageSize.height), originImage.CGImage);
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
- (UIImage*)fetchPattern:(PatternType)pattern{
if (!self.patternImage) {
return nil;
}
UIImage *tmpPattern = nil;
CGRect fetchRect = CGRectZero;
CGSize imageSize = self.patternImage.size;
switch (pattern) {
case kTopPattern:
fetchRect = CGRectMake(self.insetSize.width, 0, imageSize.width-self.insetSize.width, self.insetSize.height);
tmpPattern = [UIImage imageWithCGImage:CGImageCreateWithImageInRect(self.patternImage.CGImage, fetchRect)];
break;
case kTopRightPattern:
fetchRect = CGRectMake(0, 0, self.insetSize.width, self.insetSize.height);
tmpPattern = [UIImage imageWithCGImage:CGImageCreateWithImageInRect(self.patternImage.CGImage, fetchRect)];
break;
case kRightPattern:
break;
case kRightBottomPattern:
break;
case kBottomPattern:
break;
case kLeftBottomPattern:
break;
case kLeftPattern:
fetchRect = CGRectMake(0, self.insetSize.height, self.insetSize.width, imageSize.height-self.insetSize.height);
tmpPattern = [UIImage imageWithCGImage:CGImageCreateWithImageInRect(self.patternImage.CGImage, fetchRect)];
break;
case kLeftTopPattern:
fetchRect = CGRectMake(0, 0, self.insetSize.width, self.insetSize.height);
tmpPattern = [UIImage imageWithCGImage:CGImageCreateWithImageInRect(self.patternImage.CGImage, fetchRect)];
break;
default:
break;
}
return tmpPattern;
}
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
if (self.patternImage == nil) {
return;
}
// Drawing code.
UIImage *conLeftImage = [self fetchPattern:kLeftTopPattern];
[conLeftImage drawAtPoint:CGPointMake(0, 0)];
UIImage *topImage = [self fetchPattern:kTopPattern];
[topImage drawAsPatternInRect:CGRectMake(self.insetSize.width, 0, self.frame.size.width-self.insetSize.width*2, self.insetSize.height)];
UIImage *leftImage = [self fetchPattern:kLeftPattern];
[leftImage drawAsPatternInRect:CGRectMake(0, self.insetSize.height, self.insetSize.width, self.frame.size.height-self.insetSize.height*2)];
UIImage *conRightImage = [self fetchMirrorImage:conLeftImage direction:YES];
[conRightImage drawAtPoint:CGPointMake(self.frame.size.width-self.insetSize.width, 0)];
UIImage *rightImage = [self fetchMirrorImage:leftImage direction:YES];
CGRect rectRight = CGRectMake(self.frame.size.width-self.insetSize.width, self.insetSize.height, self.insetSize.width, self.frame.size.height-self.insetSize.height*2);
[rightImage drawAsPatternInRect:rectRight];
UIImage *botRightImage = [self fetchMirrorImage:conRightImage direction:NO];
[botRightImage drawAtPoint:CGPointMake(self.frame.size.width-self.insetSize.width, self.frame.size.height-self.insetSize.height)];
UIImage *bottomImage = [self fetchMirrorImage:topImage direction:NO];
CGRect bottomRect = CGRectMake(self.insetSize.width, self.frame.size.height-self.insetSize.height, self.frame.size.width-self.insetSize.width*2, self.insetSize.height);
[bottomImage drawAsPatternInRect:bottomRect];
UIImage *botLeftImage = [self fetchMirrorImage:conLeftImage direction:NO];
[botLeftImage drawAtPoint:CGPointMake(0, self.frame.size.height-self.insetSize.height)];
[super drawRect:rect];
}
- (void)setFrame:(CGRect)frame{
[super setFrame:frame];
[self setNeedsDisplay];
}