我想在容器视图(self.view)中使UI
Imageview(self.showImageView)中心
我尝试下面的代码它没有工作.
NSLayoutConstraint *xCenterConstraint = [NSLayoutConstraint constraintWithItem:self.showImgView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0];
[self.view addConstraint:xCenterConstraint]; NSLayoutConstraint *yCenterConstraint = [NSLayoutConstraint constraintWithItem:self.showImgView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterY multiplier:1.0 constant:0]; [self.view addConstraint:yCenterConstraint];
解决方法
尝试这个:
- (void)viewDidLoad { [super viewDidLoad]; UIView *redView = [[UIView alloc] initWithFrame:CGRectMake(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]; }
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