ios - 使用 NSAutolayout 概念如何在 ios 中的同一位置显示所有版本的按钮

Question

您好，我正在以编程方式创建按钮。我正在 ios6 和 ios7 4 英寸屏幕和 3.5 英寸屏幕上运行一些应用程序。我需要在同一位置显示所有版本的按钮。

所以我想为此使用自动布局概念。我知道如何以编程方式创建按钮，但我不知道如何为按钮应用自动布局概念。这是我的代码:

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

[button addTarget:self action:@selector(aMethod:)
 forControlEvents:UIControlEventTouchUpInside];

[button setTitle:@"Show View" forState:UIControlStateNormal];

button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);

[view addSubview:button];

Answer 1

试试这个，

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    [button addTarget:self action:@selector(aMethod:) forControlEvents:UIControlEventTouchUpInside];

    [button setTitle:@"Show View" forState:UIControlStateNormal];

    button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
    UIEdgeInsets padding = UIEdgeInsetsMake(10, 10, 10, 10);

    [self.view addConstraints:@[

                                //view1 constraints
                                [NSLayoutConstraint constraintWithItem:button
                                                             attribute:NSLayoutAttributeTop
                                                             relatedBy:NSLayoutRelationEqual
                                                                toItem:self.view
                                                             attribute:NSLayoutAttributeTop
                                                            multiplier:1.0
                                                              constant:padding.top],

                                [NSLayoutConstraint constraintWithItem:button
                                                             attribute:NSLayoutAttributeLeft
                                                             relatedBy:NSLayoutRelationEqual
                                                                toItem:self.view
                                                             attribute:NSLayoutAttributeLeft
                                                            multiplier:1.0
                                                              constant:padding.left],

                                [NSLayoutConstraint constraintWithItem:button
                                                             attribute:NSLayoutAttributeBottom
                                                             relatedBy:NSLayoutRelationEqual
                                                                toItem:self.view
                                                             attribute:NSLayoutAttributeBottom
                                                            multiplier:1.0
                                                              constant:-padding.bottom],

                                [NSLayoutConstraint constraintWithItem:button
                                                             attribute:NSLayoutAttributeRight
                                                             relatedBy:NSLayoutRelationEqual
                                                                toItem:self.view
                                                             attribute:NSLayoutAttributeRight
                                                            multiplier:1
                                                              constant:-padding.right],

                                ]];

    [self.view addSubview:button];

更新:

button.autoresizingMask = (UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin);

引用链接:Autoresizing masks programmatically vs Interface Builder / xib / nib