Basic UIImageView Question

Question

Hey guys when you set the coordinates of a UIImageView it sets the UIImageView respective to the top right corner. Is there any way to make the coordinates apply to the bottom left?

Answer 1

Answer for second question... Just import these files where you are creating uiimageview

@interface UIImageView (MyCategory)
- (id)init;
@end



@implementation UIImageView (MyCategory)

- (id)init {
    self = [super init];
    if (self) {
        self.layer.anchorPoint = CGPointMake(0, 1);
    }
    return self;
}

@end

The above code may cause come problem as the init of UIImageView might be doing some other task too, so you should do like

@interface UIImageView (MyCategory)
- (id)initMyImageView;
@end



@implementation UIImageView (MyCategory)

- (id)initMyImageView {
    [self init];
    self.layer.anchorPoint = CGPointMake(0, 1);
    return self;
}

@end

and use it like [[UIImageView alloc] initMyImageView];

Answer 2

if you have the reference of the view then you can set its anchor point uisng
view.layer.anchorPoint = CGPointMake(0,1); //your lower left corner..

0,0 means upper left corner
default is 0.5,0.5 which is center
max is 1,1 which is lower right corner
and don't forget to import <QuartzCore/QuartzCore.h>

Answer 3

UIImageView positioning settings inherited from UIView. That is why you can only manipulte by frame and center properties of your UIImageView. But you can 'simulate' left-bottom corner positioning:

UIView *yourView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, width, height)];
int bottomLeftX, bottomLeftY;

CGRect rect = yourView.frame;
yourView.frame = CGRectMake(bottomLeftX, bottomLeftY - rect.size.height, rect.size.width, rect.size.height);