如何使用自动布局在 ios 中以编程方式在 UIview 上添加 UIbutton
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【中文标题】如何使用自动布局在 ios 中以编程方式在 UIview 上添加 UIbutton【英文标题】:How to add UIbutton on UIview programmatically in ios using autolayouts 【发布时间】:2015-07-14 10:20:12 【问题描述】:我想使用自动布局以编程方式在 UIview 上添加 uibutton 并尝试了一些代码,但它不起作用请帮帮我
//使用自动布局添加UIview
UIView * myView;
myView = [UIView new];
myView.translatesAutoresizingMaskIntoConstraints = NO;
myView.backgroundColor = [UIColor colorWithRed:0.95 green:0.47 blue:0.48 alpha:1.0];
[self.view addSubview:myView];
NSLayoutConstraint * constraint = [NSLayoutConstraint constraintWithItem:myView attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeLeading multiplier:1.0f constant:30.0f];
[self.view addConstraint:constraint];
constraint = [NSLayoutConstraint constraintWithItem:myView attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeTop multiplier:1.0f constant:100.0f];
[self.view addConstraint:constraint];
constraint = [NSLayoutConstraint constraintWithItem:myView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem: nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0f constant:100.0f];
[self.view addConstraint:constraint];
constraint = [NSLayoutConstraint constraintWithItem:myView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem: nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0f constant:100.0f];
[self.view addConstraint:constraint];
使用自动布局在 uiview 上添加按钮:-
mainButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[mainButton setTitle:@"MainButton" forState:UIControlStateNormal];
[mainButton sizeToFit];
mainButton.backgroundColor = [UIColor blackColor];
mainButton.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addSubview:mainButton];
NSLayoutConstraint *constraint = [NSLayoutConstraint constraintWithItem:mainButton attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:myview attribute:NSLayoutAttributeLeading multiplier:1.0f constant:30.f];
[self.view addConstraint:constraint];
constraint = [NSLayoutConstraint constraintWithItem:mainButton attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:myview attribute:NSLayoutAttributeTop multiplier:1.0f constant:30.f];
[self.view addConstraint:constraint];
constraint = [NSLayoutConstraint constraintWithItem:mainButton attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:nil attribute:NSLayoutAttributeWidth multiplier:1.0f constant:20.f];
[self.view addConstraint:constraint];
constraint = [NSLayoutConstraint constraintWithItem:mainButton attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:nil attribute:NSLayoutAttributeHeight multiplier:1.0f constant:20.f];
[self.view addConstraint:constraint];
但是 myview 上没有添加按钮,请帮帮我
【问题讨论】:
【参考方案1】:这是有效的:
UIView *myView = [UIView new];
myView.translatesAutoresizingMaskIntoConstraints = NO;
myView.backgroundColor = [UIColor colorWithRed:0.95 green:0.47 blue:0.48 alpha:1.0];
[self.view addSubview:myView];
NSLayoutConstraint * constraint = [NSLayoutConstraint constraintWithItem:myView attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeLeading multiplier:1.0f constant:30.0f];
[self.view addConstraint:constraint];
constraint = [NSLayoutConstraint constraintWithItem:myView attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeTop multiplier:1.0f constant:100.0f];
[self.view addConstraint:constraint];
constraint = [NSLayoutConstraint constraintWithItem:myView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem: nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0f constant:140.0f];
[self.view addConstraint:constraint];
constraint = [NSLayoutConstraint constraintWithItem:myView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem: nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0f constant:100.0f];
[self.view addConstraint:constraint];
UIButton *mainButton = [UIButton new];
mainButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[mainButton setTitle:@"MainButton" forState:UIControlStateNormal];
[mainButton sizeToFit];
mainButton.backgroundColor = [UIColor blackColor];
mainButton.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addSubview:mainButton];
NSLayoutConstraint *constraint1 = [NSLayoutConstraint constraintWithItem:mainButton attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:myView attribute:NSLayoutAttributeLeading multiplier:1.0f constant:30.f];
[self.view addConstraint:constraint1];
constraint1 = [NSLayoutConstraint constraintWithItem:mainButton attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:myView attribute:NSLayoutAttributeTop multiplier:1.0f constant:30.f];
[self.view addConstraint:constraint1];
constraint1 = [NSLayoutConstraint constraintWithItem:mainButton attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:nil attribute:NSLayoutAttributeWidth multiplier:1.0f constant:20.f];
[self.view addConstraint:constraint1];
constraint1 = [NSLayoutConstraint constraintWithItem:mainButton attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:nil attribute:NSLayoutAttributeHeight multiplier:1.0f constant:20.f];
[self.view addConstraint:constraint1];
【讨论】:
【参考方案2】:您还没有为按钮定义高度限制,您已经定义了两次宽度限制。
【讨论】:
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