问题描述
我试图了解它是错误还是预期的行为.
I'm trying to understand either it's a bug or it's the expected behavior.
在 iOS 10 及更早版本上，我们可以使用navigationItem.titleView设置自定义标题.
在 iOS 11 上，设置我们的navigationItem.largeTitleDisplayMode = .always和设置navigationItem.titleView = <Some cool UIButton>时，它同时显示 和正常的导航标题栏以及较大的导航标题.
On iOS 10 and earlier we could set up a custom title, using navigationItem.titleView.
On iOS 11, when setting our navigationItem.largeTitleDisplayMode = .always and setting navigationItem.titleView = <Some cool UIButton> it's displaying both the normal navigation title bar and the large navigation title.
插图:
总结:
如何在大型导航标题上使用自定义titleView?
这是预期的结果:
推荐答案
通过使用UINavigationBar的子类并手动更改视图层次结构，我能够用自定义视图替换导航栏大标题:
I was able to replace the navigation bar big title with a custom view by using a subclass of UINavigationBar and manually changing the view hierarchy :
@interface MYNavigationBar : UINavigationBar
@end
@implementation MYNavigationBar
// ...
- (void)layoutIfNeeded
{
[self setupTitle];
[super layoutIfNeeded];
}
- (void)setupTitle
{
// UINavigationBar
// -> ...
// -> _UINavigationBarLargeTitleView
// -> UILabel << Big Title Label
// -> UIView
// -> UILabel << Big Title Label animating from back button during transitions
for (UIView *view in self.subviews) {
NSString *className = NSStringFromClass(view.classForCoder);
if ([className containsString:@"LargeTitleView"]) {
for (UIView *view2 in view.subviews) {
if ([view2 isKindOfClass:[UILabel class]]) {
[self convertLabel:(UILabel *)view2];
}
for (UIView *view3 in view2.subviews) {
if ([view3 isKindOfClass:[UILabel class]]) {
[self convertLabel:(UILabel *)view3];
}
}
}
}
}
}
- (void)convertLabel:(UILabel*)label
{
// I kept the original label in the hierarchy (with the background color as text color)
// and added my custom view as a subview.
// This allow the transformations applied to the original label to be also applied to mine.
}
请注意，由于这种技巧，苹果可能拒绝了您的应用.
Please note that Apple might reject your app because of this trick.
这篇关于iOS 11-使用大标题模式时，UINavigationItem titleView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！