布局问题

[诚实可靠小码农]

UIView里面有一个UIImageView我现在想让UIVIew适配屏幕大小
NSLayoutConstraint *constraintTop = [NSLayoutConstraint constraintWithItem:self.imageCropper attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeTop multiplier:1 constant:0];

NSLayoutConstraint *constraintBottom = [NSLayoutConstraint constraintWithItem:self.imageCropper attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeBottom multiplier:1 constant:0];

NSLayoutConstraint *constraintLeft = [NSLayoutConstraint constraintWithItem:self.imageCropper attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeLeft multiplier:1 constant:0];

NSLayoutConstraint *constraintRight = [NSLayoutConstraint constraintWithItem:self.imageCropper attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeRight multiplier:1 constant:0];
但是UIView不是在中间
setTranslatesAutoresizingMaskIntoConstraints:NO已经设置

求解答

[LmyangBK]

对于单个控件相对于其父视图的布局你直接用autoresizingMask属性就行了。不需要用autoLayout布局。如果真想用，可以去掉底部和右边的约束条件，改为宽高的约束试试

[LmyangBK]

- (void)addContraints { NSLayoutConstraint *constraints = [NSLayoutConstraint constraintWithItem:view attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeTop multiplier:1.0 constant:0]; [self.view addConstraint:constraints]; constraints = [NSLayoutConstraint constraintWithItem:view attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeWidth multiplier:1.0 constant:0]; [self.view addConstraint:constraints]; constraints = [NSLayoutConstraint constraintWithItem:view attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeHeight multiplier:1.0 constant:0]; [self.view addConstraint:constraints]; constraints = [NSLayoutConstraint constraintWithItem:view attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeLeft multiplier:1.0 constant:0]; [self.view addConstraint:constraints]; } 这样写就行了。