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iOS Layout
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| // | |
| // ViewController.m | |
| // testLayout | |
| // | |
| // Created by Ben Liu on 19/11/2015. | |
| // Copyright (c) 2015 Ben Liu. All rights reserved. | |
| // | |
| #import "ViewController.h" | |
| @interface ViewController () | |
| @end | |
| @implementation ViewController | |
| - (void)viewDidLoad { | |
| [super viewDidLoad]; | |
| // self.view is the super view | |
| UIView *superview = self.view; | |
| UIView *view1 = [[UIView alloc] init]; | |
| view1.translatesAutoresizingMaskIntoConstraints = NO; | |
| view1.backgroundColor = [UIColor colorWithRed:0.95 green:0.47 blue:0.48 alpha:1.0]; | |
| [superview addSubview:view1]; | |
| UIEdgeInsets padding = UIEdgeInsetsMake(40, 10, 10, 10); | |
| [superview addConstraints:@[ | |
| //view1 constraints | |
| // I found out by using UI native Auto Layout you must have the 4 contraints at | |
| // At the same time | |
| [NSLayoutConstraint constraintWithItem:view1 | |
| attribute:NSLayoutAttributeTop | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:superview | |
| attribute:NSLayoutAttributeTop | |
| multiplier:1.0 | |
| constant:padding.top], | |
| [NSLayoutConstraint constraintWithItem:view1 | |
| attribute:NSLayoutAttributeLeading | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:superview | |
| attribute:NSLayoutAttributeLeft | |
| multiplier:1.0 | |
| constant:padding.left], | |
| [NSLayoutConstraint constraintWithItem:view1 | |
| attribute:NSLayoutAttributeBottom | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:superview | |
| attribute:NSLayoutAttributeBottom | |
| multiplier:0.5 // half of the height of superview | |
| constant:-padding.bottom], | |
| [NSLayoutConstraint constraintWithItem:view1 | |
| attribute:NSLayoutAttributeTrailing | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:superview | |
| attribute:NSLayoutAttributeRight | |
| multiplier:1 | |
| constant:-padding.right], | |
| ]]; | |
| // 0x03. Add another view | |
| UIView *view2 = [[UIView alloc] init]; | |
| view2.translatesAutoresizingMaskIntoConstraints = NO; | |
| view2.backgroundColor = [UIColor colorWithRed:1.00 green:0.83 blue:0.58 alpha:1.0]; | |
| [superview addSubview:view2]; | |
| UIEdgeInsets padding2 = UIEdgeInsetsMake(10, 10, 10, 10); | |
| [superview addConstraints:@[ | |
| //view1 constraints | |
| [NSLayoutConstraint constraintWithItem:view2 | |
| attribute:NSLayoutAttributeTop | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:view1 | |
| attribute:NSLayoutAttributeBottom | |
| multiplier:1.0 | |
| constant:padding2.top], | |
| [NSLayoutConstraint constraintWithItem:view2 | |
| attribute:NSLayoutAttributeLeft | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:superview | |
| attribute:NSLayoutAttributeLeft | |
| multiplier:1.0 | |
| constant:padding2.left], | |
| [NSLayoutConstraint constraintWithItem:view2 | |
| attribute:NSLayoutAttributeBottom | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:superview | |
| attribute:NSLayoutAttributeBottom | |
| multiplier:1.0 | |
| constant:-padding2.bottom], | |
| [NSLayoutConstraint constraintWithItem:view2 | |
| attribute:NSLayoutAttributeRight | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:superview | |
| attribute:NSLayoutAttributeRight | |
| multiplier:1 | |
| constant:-padding2.right], | |
| ]]; | |
| } | |
| - (void)didReceiveMemoryWarning { | |
| [super didReceiveMemoryWarning]; | |
| // Dispose of any resources that can be recreated. | |
| } | |
| @end |
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