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我想要一个imageview出现在底部的中心,我将imageview添加到视图控制器中的另一个图像视图。结果是imageview出现在底部但不完全在中心,任何人都可以建议我的代码中出现了什么问题?如何将UIImageView对齐到视图控制器的中心?
-(void)viewWillAppear:(BOOL)animated
{
UIImageView *imgView=[[UIImageView alloc]init];
[imgView setTranslatesAutoresizingMaskIntoConstraints:NO];
UIImageView *mspimgvw=[[UIImageView alloc]init];
[mspimgvw setTranslatesAutoresizingMaskIntoConstraints:NO];
mspimgvw.image=[UIImage imageNamed:@"msplogo.jpg"];
[self.imgView addSubview:mspimgvw];
[self.view addSubview:imgView];
CGFloat bottom=0;
[imgView addConstraint:[NSLayoutConstraint constraintWithItem:mspimgvw attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:imgView attribute:NSLayoutAttributeBottom multiplier:1 constant:bottom-40]];
[imgView addConstraint:[NSLayoutConstraint constraintWithItem:mspimgvw attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:imgView attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:bottom-40]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[imgView]|" options:0 metrics: 0 views:dicViews]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[imgView]|" options:0 metrics: 0 views:dicViews]];
}
我想要图像出现在视图控制器的中心。在我的代码中更改什么?
谢谢你帮我除了需要添加属性:NSLayoutAttributeBottom做出出现在底部的UIImageView。 – StackUser 2014-11-04 08:56:51
是的你是对的,编辑答案,所以你可以现在接受它。 :) – RJiryes 2014-11-04 09:08:21
你可以建议如何实现UITabBar的自动布局,如果我添加约束我看不到水平线的选项卡bar.my代码是 [self.view addConstraint:[NSLayoutConstraint constraintWithItem:tabbarObj attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeBottom multiplier:1 constant:0]]; – StackUser 2014-11-04 09:17:16