CODEWITHSUNDEEP
iphoneuiviewcore-graphicscgaffinetransform
Dario
Dario

Reputation: 1315

Bounds of a rotated UIView and Core Graphics

I have a subclass of UIView which is drawing a location icon. When I rotate the view a few degrees it's bounds (highlighted in green using CGContextAddRect) seem to change drastically causing my drawing to look distorted.


(source: bytolution.com)


(source: bytolution.com)

Here's my code:

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    self.locationTagView.frame = CGRectMake(40, 80, 240, 240);
    CGAffineTransform transform = CGAffineTransformMakeRotation(DegreesToRadians(30));
    self.locationTagView.transform = transform;
    [self.view addSubview:self.locationTagView];
}

Upvotes: 1

Views: 475

Answers (1)

Dario
Dario

Reputation: 1315

This fixes it:

#define LOCTAG_HEIGHT 240
#define LOCTAG_WIDTH 240

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    self.locationTagView.frame = CGRectMake(40, 80, LOCTAG_WIDTH, LOCTAG_HEIGHT);
    self.locationTagView.bounds = CGRectMake(0, 0, LOCTAG_WIDTH, LOCTAG_HEIGHT);
    CGAffineTransform transform = CGAffineTransformMakeRotation(DegreesToRadians(340));
    self.locationTagView.transform = transform;
    [self.view addSubview:self.locationTagView];
}


(source: bytolution.com)

Setting the bounds separately makes it work!

Upvotes: 2

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