使用第三方框架 Keep Layout 实现简单的自动布局

 1 - (void)viewDidLoad {
 2     [super viewDidLoad];
 3     // Do any additional setup after loading the view, typically from a nib.
 4     
 5     [self setUpFourViews];
 6    
 7 }
 8 - (void)setUpFourViews {
 9     
10     UIView *redView = [[UIView alloc] init];
11     
12     redView.backgroundColor = [UIColor redColor];
13     [self.view addSubview:redView];
14     
15     
16     UIView *blueView = [[UIView alloc] init];
17     blueView.backgroundColor = [UIColor blueColor];
18     [self.view addSubview:blueView];
19     
20     UIView *greenView = [[UIView alloc] init];
21     
22     greenView.backgroundColor = [UIColor greenColor];
23     [self.view addSubview:greenView];
24     
25     
26     UIView *purpleView = [[UIView alloc] init];
27     purpleView.backgroundColor = [UIColor purpleColor];
28     [self.view addSubview:purpleView];
29     
30     [self testWithRedView:redView blueView:blueView];
31     
32     [self testWithGreenView:greenView purpleView:purpleView];
33 
34 }
35 - (void)testWithGreenView:(UIView *)greenView purpleView:(UIView *)purpleView {
36     
37     greenView.keepBottomInset.equal = 30;//离父view的底部间距为30
38     greenView.keepLeftInset.equal = 30;//离父view的左间距为30
39     greenView.keepRightOffsetTo(purpleView).equal = 30;//离blueView的右边间距为30
40     greenView.keepHeight.equal = 50;//高度为50
41     greenView.keepWidthTo(purpleView).equal = 1;//宽度和blueView相等
42     
43     purpleView.keepBottomAlignTo(greenView).equal = 1;//和redView的底部对齐
44     purpleView.keepRightInset.equal = 30;//离父view的右间距为30
45     purpleView.keepHeightTo(greenView).equal = 2;//高度是redView的2倍
46 }
47 
48 - (void)testWithRedView:(UIView *)redView blueView:(UIView *)blueView {
49     
50     redView.keepTopInset.equal = 30;//离父view的顶部间距为30
51     redView.keepRightInset.equal = 30;//离父view的右间距为30
52     redView.keepLeftInset.equal = 30;//离父view的左间距为30
53     redView.keepHeight.equal = 50;
54     
55     blueView.keepLeftInset.equal = 30;//离父view的左间距为30
56     blueView.keepRightInset.equal = 30;//离父view的右间距为30
57     blueView.keepTopOffsetTo(redView).equal = 30;//离redView的顶部间距为30
58     blueView.keepHeightTo(redView).equal = 1;//高度和redView的相等
59 }