The Core iOS Developer’s Cookbook, Fifth Edition

Frames

A frame rectangle refers to the outline of a view in terms of its parent’s coordinate system. Frames use a CGRect structure, which is defined as part of the Core Graphics framework, as its CG prefix suggests. A CGRect is made up of an origin (a CGPoint, x and y) and a size (a CGSize, width and height). When you create views outside Auto Layout, you normally allocate them and initialize them with a frame. Here’s an example:

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CGRect rect = CGRectMake(0.0f, 0.0f, 320.0f, 416.0f); myView = [[UIView alloc] initWithFrame:rect];

Views provide two fundamental CGRect properties, which are closely tied together: frame and bounds. Frames are different from bounds in terms of their coordinate system. Frames are defined ...