Created
October 8, 2014 19:53
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| @interface UIView (LayoutConvenience) | |
| - (NSLayoutConstraint *)constraintAligningAttribute:(NSLayoutAttribute)attr withView:(UIView *)otherView; | |
| @end | |
| @implementation UIView (LayoutConvenience) | |
| - (NSLayoutConstraint *)constraintAligningAttribute:(NSLayoutAttribute)attr withView:(UIView *)otherView { | |
| return [NSLayoutConstraint constraintWithItem:self attribute:attr relatedBy:NSLayoutRelationEqual toItem:otherView attribute:attr multiplier:1.0 constant:0.0]; | |
| } | |
| @end | |
| @implementation ViewController | |
| - (void)viewDidLoad { | |
| [super viewDidLoad]; | |
| UILabel *label1 = [[UILabel alloc] init]; | |
| label1.text = @"Label 1"; | |
| label1.textAlignment = NSTextAlignmentCenter; | |
| UILabel *label2 = [[UILabel alloc] init]; | |
| label2.text = @"Label 2"; | |
| label2.textAlignment = NSTextAlignmentCenter; | |
| label2.font = [UIFont systemFontOfSize:40]; | |
| UIView *groupingView = [[UIView alloc] init]; | |
| [[self view] addSubview:groupingView]; | |
| [groupingView addSubview:label1]; | |
| [groupingView addSubview:label2]; | |
| id views = NSDictionaryOfVariableBindings(label1,label2,groupingView); | |
| for (UIView *view in [views allValues]) { | |
| [view setTranslatesAutoresizingMaskIntoConstraints:NO]; | |
| } | |
| [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[label1]|" options:0 metrics:nil views:views]]; | |
| [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[label2]|" options:0 metrics:nil views:views]]; | |
| [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[label1][label2]|" options:0 metrics:nil views:views]]; | |
| [[self view] addConstraint:[[self view] constraintAligningAttribute:NSLayoutAttributeCenterX withView:groupingView]]; | |
| [[self view] addConstraint:[[self view] constraintAligningAttribute:NSLayoutAttributeCenterY withView:groupingView]]; | |
| } | |
| @end |
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