ios - 为什么当我尝试创建按钮组时按钮折叠了？

Question

我正在尝试水平创建一个 UIButton 组。

所以我创建了两个按钮并创建了一个新 View 来包含它们。然后我添加约束以使其水平均匀放置。

但是两个 UIButtons 刚刚折叠起来。按钮的初始位置是相同的，但我认为这并不重要。

- (UIButton*) getButtonWithTitle: (NSString*) title
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
    button.frame = CGRectMake(0, 80, 130.0, 40.0);

    button.layer.borderColor  = [UIColor blackColor].CGColor;
    button.layer.borderWidth  = 0.5f;
    button.layer.cornerRadius = 2.0f;

    [button setTitle:title forState:UIControlStateNormal];
    [button setTitleColor:[UIColor blackColor] forState: UIControlStateNormal];
    return button;
}

- (void)viewDidLoad {
    [super viewDidLoad];

    UIButton *loginBtn    = [self getButtonWithTitle:@"Login"];
    UIButton *registerBtn = [self getButtonWithTitle:@"Register"];

    UIView *buttonGroup = [[UIView alloc] init];
    [buttonGroup setTranslatesAutoresizingMaskIntoConstraints:NO];
    [buttonGroup addSubview: loginBtn];
    [buttonGroup addSubview: registerBtn];
    [self.view addSubview: buttonGroup];

    NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings(loginBtn, registerBtn, buttonGroup);
    [buttonGroup addConstraints:
     [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[loginBtn]-20-[registerBtn]-|"
                                             options:0 metrics:nil
                                               views:viewsDictionary
      ]];
}

编辑

我按照deimus并删除了buttonGroup，但没有变化:

Answer 1

从此行中删除 buttonGroup 并重试。

NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings(loginBtn, registerBtn, buttonGroup);

同时删除

button.frame = CGRectMake(0, 80, 130.0, 40.0);

当您选择使用 AutoLayouting 提供手动坐标不再有意义时