[英]merge multiple UIImages on iOS
我想在iOS中合並多個UIImage。 為此,我嘗試執行以下操作:
UIImage *imageLeft = [UIImage imageNamed:@"ico-left"];
UIImage *imageRight = [UIImage imageNamed:@"ico-right"];
CGSize size = CGSizeMake(imageLeft.size.width + imageRight.size.width, imageLeft.size.height);
UIGraphicsBeginImageContext(size);
[imageLeft drawInRect:CGRectMake(0, 0, imageLeft.size.width, imageLeft.size.height)];
[imageRight drawInRect:CGRectMake(imageLeft.size.width, 0, imageRight.size.width, imageRight.size.height)];
UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, finalImage.size.width, finalImage.size.height)];
imageView.image = finalImage;
[cell.contentView addSubview:imageView];
但是我無法得到任何圖像。 我該如何解決? 謝謝。
我認為您沒有添加圖片擴展名(.png),因此可以通過以下方式更改上面的兩行
UIImage *imageLeft = [UIImage imageNamed:@"ico-left.png"];
UIImage *imageRight = [UIImage imageNamed:@"ico-right.png"];
我不確定這是否是您的問題,但是您可以嘗試一下。 有時候對我有用
NSString *path1 = [[NSBundle mainBundle] pathForResource:@"ico-left" ofType:@"png"];
NSString *path2 = [[NSBundle mainBundle] pathForResource:@"ico-right" ofType:@"png"];
UIImage *imageLeft = [[UIImage alloc] initWithContentsOfFile:path1];
UIImage *imageRight = [[UIImage alloc] initWithContentsOfFile:path2];
這是我用來合並圖像的代碼。 (我認為我有時會在網上找到全部或部分內容)。 將其放在UIImage類別中。
// NOTE! this method should only be called from the main thread because of
// UIGraphicsGetImageFromCurrentImageContext();
- (UIImage *)merge:(UIImage *)image atRect:(CGRect)pos overlay:(BOOL)overlay fillColor:(UIColor *)fill
{
UIGraphicsBeginImageContext(self.size);
UIImage *bottom = (overlay)?self:image;
UIImage *top = (overlay)?image:self;
CGRect lf = CGRectMake(0, 0, self.size.width, self.size.height);
CGRect bottomRect = (overlay)?lf:pos;
CGRect topRect = (overlay)?pos:lf;
if (fill){
[fill setFill];
CGContextFillRect (UIGraphicsGetCurrentContext(), topRect);
}
[bottom drawInRect:bottomRect];
[top drawInRect:topRect];
UIImage *destImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return destImage;
}
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