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我是一位新手,以编程方式计算出自动布局。Autolayout不会垂直添加间隙
我定义了一个imageview,添加到superview(UIViewController)。使用视觉格式添加约束来设置差距。我没有提供价值只是破折号( - )。根据资源iam提到学习,没有提供价值,我会得到8pts的差距。
我水平但不垂直地得到空白。
- (void)viewDidLoad {
[super viewDidLoad];
UIImageView * thumbnailImageView = [[UIImageView alloc] init];
thumbnailImageView.backgroundColor = [UIColor greenColor];
thumbnailImageView.image = [UIImage imageNamed:@"thumbnailImage"];
thumbnailImageView.contentMode = UIViewContentModeScaleAspectFill;
thumbnailImageView.layer.masksToBounds = true;
thumbnailImageView.translatesAutoresizingMaskIntoConstraints = false;
[self.view addSubview:thumbnailImageView];
[self.view addConstraints:[NSLayoutConstraint
constraintsWithVisualFormat:@"V:|-[thumbnailImageView]-|" options:0
metrics:nil
views:NSDictionaryOfVariableBindings(thumbnailImageView)]];
[self.view addConstraints:[NSLayoutConstraint
constraintsWithVisualFormat:@"H:|-[thumbnailImageView]-|" options:0
metrics:nil
views:NSDictionaryOfVariableBindings(thumbnailImageView)]];
谢谢帮助 – ios