[英]Using the autolayout visual format language is it possible to set the width of a view equal to the height of the same view?
使用autolayout可视化格式语言可以将视图的宽度设置为等于同一视图的高度吗?
这是我想要做的:
[view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[stopButton(100)]" options:kNilOptions metrics:nil views:views]];
[view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-50-[stopButton(stopButton.height)" options:kNilOptions metrics:nil views:views]];
Luke Van In对固定宽高比的回答是一个很好的答案!
当然,如果您只想在多个位置使用相同的值,则可以修改代码以使用度量字典,如下所示:
NSDictionary* metrics = @{@"stopButtonSize":@100};
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[stopButton(stopButtonSize)]" options:kNilOptions metrics:metrics views:views]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-50-[stopButton(stopButtonSize)]" options:kNilOptions metrics:metrics views:views]];
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