iOS AutoLayout代码版

最新推荐文章于 2024-08-14 23:42:59 发布

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#ios #AutoLayout

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本文通过实例演示了如何使用Auto Layout在iOS应用中为不同视图设置约束条件，包括水平和垂直约束，确保视图能在不同屏幕尺寸下正确显示。

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- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    //aView
    UIView *aView = [[UIView alloc] init];
    aView.backgroundColor = [UIColor lightGrayColor];
    [self.view addSubview:aView];

    //让约束生效
    aView.translatesAutoresizingMaskIntoConstraints = NO;
    //设置水平约束
    NSArray *contraint = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-100-[aView]-100-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(aView)];
    //设置纵向约束
    NSArray *contraint2 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-50-[aView(50)]" options:0 metrics:nil views:NSDictionaryOfVariableBindings(aView)];
    [self.view addConstraints:contraint];
    [self.view addConstraints:contraint2];

    //bView
    UIView *bView = [[UIView alloc] init];
    bView.backgroundColor = [UIColor redColor];
    [self.view addSubview:bView];
    bView.translatesAutoresizingMaskIntoConstraints = NO;
    NSArray *contraint3 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[bView(100)]" options:0 metrics:nil views:NSDictionaryOfVariableBindings(bView)];
    NSArray *contraint4 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-120-[bView(aView)]" options:0 metrics:nil views:NSDictionaryOfVariableBindings(bView,aView)];
    [self.view addConstraints:contraint3];
    [self.view addConstraints:contraint4];

    //cView
    UIView *cView = [[UIView alloc] init];
    cView.backgroundColor = [UIColor cyanColor];
    [self.view addSubview:cView];

    cView.translatesAutoresizingMaskIntoConstraints = NO;

    NSArray *contraint5 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:[bView]-[cView]-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(cView,bView)];
    NSArray *contraint6 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-120-[cView(bView)]" options:0 metrics:nil views:NSDictionaryOfVariableBindings(cView,bView)];
    [self.view addConstraints:contraint5];
    [self.view addConstraints:contraint6];
}

这里写图片描述