iphone - 在 View Controller 的宽度上水平均匀分布 UIButton 的最简单方法？

Question

我看了很多答案，它们看起来都很复杂!最近我在看 this answer尽管我不想将我的按钮放在 View 中。

我有 6 个尺寸相同的 UIButton。我想在我的 Root View Controller 的整个宽度和底部将它们水平均匀地隔开。

|                                      |
|                                      |
|  [b1]  [b2]  [b3]  [b4]  [b5]  [b6]  |
________________________________________

以编程方式实现此目的的最简单方法是什么？

Answer 1

我认为这比已接受答案上的链接更简单。好的，首先让我们创建一些按钮:

UIButton *button1 = [UIButton buttonWithType:UIButtonTypeSystem];
button1.translatesAutoresizingMaskIntoConstraints = NO;
[button1 setTitle:@"Btn1" forState:UIControlStateNormal];

... 对 6 个按钮执行 6 次，但是你喜欢然后将它们添加到 View 中:

[self.view addSubview:button1];
[self.view addSubview:button2];
[self.view addSubview:button3];
[self.view addSubview:button4];
[self.view addSubview:button5];
[self.view addSubview:button6];

将一个按钮固定到 View 的底部:

[self.view addConstraint:[NSLayoutConstraint constraintWithItem:button1 attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeBottom multiplier:1 constant:0]];

然后告诉所有按钮等宽并在整个宽度上均匀分布:

NSDictionary *views = NSDictionaryOfVariableBindings(button1, button2, button3, button4, button5, button6);
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[button1][button2(==button1)][button3(==button1)][button4(==button1)][button5(==button1)][button6(==button1)]|" options:NSLayoutFormatAlignAllBottom metrics:nil views:views]];

结果: