View Full Version : How can I place an image behind an imageView.

Apr 15, 2011, 03:14 AM
I've got an image which contains multiple layers. The user can set a picture as a layer. However when there isn't a picture available I'd like to have a replacement picture.

I think I got two options:

1. check if the image (taken photo) is loaded into my directory. if not place the other image.
2. placing the other image (photo_icon.png) to the back of the UIImageView (image1). When a photo hasn't been taken the image becomes visible.

Here's a snippit of my code so far.

NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *pngFilePath = [NSString stringWithFormat:@"%@/photo1.png",docDir];
UIImage *img = [[UIImage alloc] initWithContentsOfFile:pngFilePath];
[image1 setImage:img];
image1.layer.cornerRadius = 15.0;
image1.layer.masksToBounds = YES;

CALayer *sublayer = [CALayer layer];
image1.layer.borderColor = [UIColor blackColor].CGColor;
image1.layer.borderWidth = 3.5;
[image1.layer addSublayer:sublayer];

CALayer *imageLayer = [CALayer layer];
imageLayer.frame = image1.bounds;
imageLayer.cornerRadius = 10.0;
imageLayer.contents = (id) [UIImage imageNamed:@"Upperlayer.png"].CGImage;
imageLayer.masksToBounds = YES;
[sublayer addSublayer:imageLayer];

replacing the image1 for the image which is needed I use:

CALayer *imageBackLayer = [CALayer layer];
imageBackLayer.frame = image1.bounds;
imageBackLayer.cornerRadius = 10.0;
imageBackLayer.contents = (id) [UIImage imageNamed:@"photo_icon.png"].CGImage;
imageBackLayer.masksToBounds = NO;
[sublayer insertSublayer:imageBackLayer below: image1.layer ];

Thanks in advance!