ios 如何以编程方式使 UIImageView 在容器中垂直居中并带有约束
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How to make a UIImageView, center vertically in container with constraints programmatically
提问by iTamilan
I want to center UIImageView (self.showImageView) in container view (self.view)
我想self.showImageView在容器视图 ( self.view) 中居中 UIImageView ( )
I tried below code it did't work:
我试过下面的代码它没有用：
NSLayoutConstraint *xCenterConstraint = [NSLayoutConstraint constraintWithItem:self.showImageView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0];
[self.view addConstraint:xCenterConstraint];
NSLayoutConstraint *yCenterConstraint = [NSLayoutConstraint constraintWithItem:self.showImageView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterY multiplier:1.0 constant:0];
[self.view addConstraint:yCenterConstraint];
回答by Vitaliy Gozhenko
Try this:
尝试这个：
- (void)viewDidLoad
{
[super viewDidLoad];
UIView *redView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 100)];
redView.backgroundColor = [UIColor redColor];
redView.translatesAutoresizingMaskIntoConstraints = NO;
[self.view addSubview:redView];
[redView addConstraint:[NSLayoutConstraint constraintWithItem:redView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:0 multiplier:1 constant:100]];
[redView addConstraint:[NSLayoutConstraint constraintWithItem:redView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:0 multiplier:1 constant:200]];
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:redView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterY multiplier:1 constant:0]];
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:redView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterX multiplier:1 constant:0]];
[self.view addSubview:redView];
}
回答by Sudhin Davis
Try
尝试
self.showImageView.center=self.view.center;
This will do your work by setting self.showImageView to the center of self.view.
这将通过将 self.showImageView 设置为 self.view 的中心来完成您的工作。
