如何使用自动布局在ios中以编程方式在UIview上添加UIbutton
我想使用autolayouts以编程方式在UIview上添加uibutton,并尝试了一些代码,但不起作用,请帮助我一些 //使用自动布局添加UIview 使用自动布局在uiview上添加按钮:-如何使用自动布局在ios中以编程方式在UIview上添加UIbutton,ios,objective-c,Ios,Objective C,我想使用autolayouts以编程方式在UIview上添加uibutton,并尝试了一些代码,但不起作用,请帮助我一些 //使用自动布局添加UIview 使用自动布局在uiview上添加按钮:- 但是按钮没有添加到myview上,请帮助我一些按钮您没有为按钮定义高度约束,您已经定义了两次宽度约束 这是有效的: UIView *myView = [UIView new]; myView.translatesAutoresizingMaskIntoConstraints = NO; myView.
但是按钮没有添加到myview上,请帮助我一些按钮您没有为按钮定义高度约束,您已经定义了两次宽度约束 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];
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];
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];