iphone - 一起自动布局水平和垂直格式

如何在constraintsWithVisualFormat中一起添加水平和垂直视觉格式？只有水平。我想添加V:| -50- [leftButton]和V:| -50- [rightButton]。怎么做？创建另一个NSLayoutConstraint？

- (void)viewDidLoad
{
    [super viewDidLoad];
    UIButton *leftButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [leftButton setTitle:@"Left" forState:UIControlStateNormal];
    [leftButton setTranslatesAutoresizingMaskIntoConstraints:NO];
    [self.view addSubview:leftButton];
    UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [rightButton setTitle:@"Right" forState:UIControlStateNormal];
    [rightButton setTranslatesAutoresizingMaskIntoConstraints:NO];
    [self.view addSubview:rightButton];

    NSArray *layoutConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-50-[leftButton(>=80)]-50-[rightButton(>=80)]" options:0 metrics:nil views:NSDictionaryOfVariableBindings(leftButton, rightButton)];
    [self.view addConstraints:layoutConstraints];
}

最佳答案

您可以根据需要使用可视格式创建尽可能多的独立约束集。您不能在同一字符串中混合水平和垂直约束，但是没有什么阻止您创建:

H:|-[view]-|

其次是

V:|-[view]-|

可以将每个VFL语句视为在 super 视图的单行或单列中表示布局。