iOS 使用LayoutGuide 來限制控制項的位置,配合Auto Layout constraints

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iOS 使用LayoutGuide 來限制控制項的位置,配合Auto Layout constraints

UIButton *button = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];

[self.view addSubview:button];

 

[button setTranslatesAutoresizingMaskIntoConstraints: NO];

 

// 得到當前視圖的最低基準限制,這個是對於Auto Layout constraint來說的。

id bottomGuide = self.bottomLayoutGuide;

NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings (button, bottomGuide);

[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat: @"V:[button]-20-[bottomGuide]"

options: 0

metrics: nil

views: viewsDictionary]];

 

[self.view layoutSubviews];

 

同理可以得到topLayoutGuide,這個是視圖最高基準限制

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