在我的viewDidAppear
方法(我调用超级方法)中,我有以下代码:
UIScrollView *navbar = [[UIScrollView alloc] init];
[navbar setScrollEnabled:YES];
[navbar setBackgroundColor:[UIColor redColor]];
[navbar setTranslatesAutoresizingMaskIntoConstraints:NO];
[self.view addSubview:navbar];
NSDictionary *viewsDictionary2 = NSDictionaryOfVariableBindings(navbar);
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"|[navbar]|"
options:0
metrics:nil
views:viewsDictionary2]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[navbar]|"
options:0
metrics:nil
views:viewsDictionary2]];
NSArray *categories = @[@"nav1", @"nav2", @"nav3", @"nav4", @"nav5", @"nav6", @"nav7", @"nav8", @"nav9", @"nav10", @"nav11", @"nav12", @"nav13"];
NSMutableArray *tempCategoryImages = [NSMutableArray array];
for (NSInteger i = 0; i < categories.count; i++)
{
[tempCategoryImages insertObject:[UIImage imageNamed:categories[i]] atIndex:i];
}
NSArray *categoryImages = [tempCategoryImages copy];
// Add subviews.
//
CGFloat xPadding = 25.0f;
UIView *previousImageView = NULL;
for (NSInteger i = 0; i < categoryImages.count; i++)
{
UIImageView *imageView = [[UIImageView alloc] initWithImage:categoryImages[i]];
[imageView setTranslatesAutoresizingMaskIntoConstraints:NO];
[navbar addSubview:imageView];
if (i == 0) {
//
// First category.
//
[navbar addConstraint:[NSLayoutConstraint constraintWithItem:imageView
attribute:NSLayoutAttributeLeft
relatedBy:NSLayoutRelationEqual
toItem:imageView.superview
attribute:NSLayoutAttributeLeft
multiplier:1
constant:0]];
} else {
//
// End categories.
//
[navbar addConstraint:[NSLayoutConstraint constraintWithItem:imageView
attribute:NSLayoutAttributeLeft
relatedBy:NSLayoutRelationEqual
toItem:previousImageView
attribute:NSLayoutAttributeRight
multiplier:1
constant:xPadding]];
}
[navbar addConstraint:[NSLayoutConstraint constraintWithItem:imageView
attribute:NSLayoutAttributeCenterY
relatedBy:NSLayoutRelationEqual
toItem:imageView.superview
attribute:NSLayoutAttributeCenterY
multiplier:1
constant:0]];
previousImageView = imageView;
}
// Set content size.
//
CGSize scrollContentSize = CGSizeZero;
for (NSInteger i = 0; i < categories.count; i++)
{
UIImage *tempImage = [UIImage imageNamed:categories[i]];
// Width.
//
scrollContentSize.width += tempImage.size.width;
// Height.
//
if (tempImage.size.height > scrollContentSize.height) {
scrollContentSize.height = tempImage.size.height;
}
}
navbar.contentSize = scrollContentSize;
当我记录滚动视图属性时,它具有子视图、足够大的内容大小并启用了滚动。
即使我将其添加UIScrollView
到 IB 并将其链接到相同的代码,它仍然可以工作吗?(我注释掉NSAutoLayout
代码。
这让我相信 UIScrollView 工作,我不能使用自动布局。
我错过了什么吗?
谢谢
编辑
initWithFrame:
当我尝试使用框架时,代码也无法以编程方式工作setTranslatesAutoresizingMaskIntoConstraints:YES