The Core iOS Developer’s Cookbook, Fifth Edition

Putting It Together

Using these tools, we can replace the old label-creation method above with a much more powerful variant that uses Auto Layout:

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- (UILabel *)createLabelWithTitle:(NSString *)title     onParent:(UIView *)parentView {     UILabel *label = [[UILabel alloc] init];     label.textAlignment = NSTextAlignmentCenter;     label.text = title;     // Add label to parent view so constraints can be added     [parentView addSubview:label];     // Turn off automatic translation of autoresizing masks into constraints     label.translatesAutoresizingMaskIntoConstraints = NO;     // Add constraints     [label constrainWithinSuperviewBounds];     [label constrainSize:CGSizeMake(100, 100)];     [label constrainPosition:CGPointMake(50, ...