iOS：iOS中UIButton的垂直对齐

Question

我需要为四个按钮添加垂直对齐方式，以便它应该在下面移动几个点。 下面是我的代码，现在它在水平顶部显示了四个UIButton。

UIButton *button1 = [UIButton buttonWithType:UIButtonTypeSystem];
[button1 setTitle:@"CLOTHING" forState:UIControlStateNormal];
button1.backgroundColor = [UIColor orangeColor];
button1.translatesAutoresizingMaskIntoConstraints = NO;

UIButton *button2 = [UIButton buttonWithType:UIButtonTypeSystem];
[button2 setTitle:@"ACCESSORIES" forState:UIControlStateNormal];
button2.backgroundColor = [UIColor orangeColor];
button2.translatesAutoresizingMaskIntoConstraints = NO;

UIButton *button3 = [UIButton buttonWithType:UIButtonTypeSystem];
[button3 setTitle:@"FOOTWEAR" forState:UIControlStateNormal];
button3.backgroundColor = [UIColor orangeColor];
button3.translatesAutoresizingMaskIntoConstraints = NO;

UIButton *button4 = [UIButton buttonWithType:UIButtonTypeSystem];
[button4 setTitle:@"GARMENT" forState:UIControlStateNormal];
button4.backgroundColor = [UIColor orangeColor];
button4.translatesAutoresizingMaskIntoConstraints = NO;

[self.view addSubview:button1];
[self.view addSubview:button2];
[self.view addSubview:button3];
[self.view addSubview:button4];

NSDictionary *views = NSDictionaryOfVariableBindings(button1, button2,button3,button4);
NSArray *horizontalConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-5-[button1]-5-[button2]-5-[button3]-5-[button4]-5-|"
                                                                         options:NSLayoutFormatAlignAllCenterY
                                                                         metrics:nil
                                                                           views:views];

// Find the equal width constraint and set priority to high (750)
for (NSLayoutConstraint *constraint in horizontalConstraints) {
    if (constraint.firstAttribute == NSLayoutAttributeWidth) {
        constraint.priority = UILayoutPriorityDefaultHigh;
    }
}

[self.view addConstraints:horizontalConstraints];

Answer 1

您正在提供水平约束以此更改约束

  NSArray *horizontalConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-15-[button1]-5-[button2]-5-[button3]-5-[button4]"
                                                                         options:0
                                                                         metrics:nil
                                                                           views:views];