[英]UITraitCollection - swift to objective-C
我正在尝试将swift转换为Objective-C。 这是我的代码如下:
迅速
import UIKit
protocol TraitCollectionOverridable {
func preferredTraitCollection() -> UITraitCollection?
}
class CustomNavigationController: UINavigationController {
override func overrideTraitCollectionForChildViewController(childViewController: UIViewController) -> UITraitCollection? {
guard let conformingViewController = childViewController as? TraitCollectionOverridable else {
return super.overrideTraitCollectionForChildViewController(childViewController)
}
return conformingViewController.preferredTraitCollection()
}
}
Objective-C头文件
@protocol TraitCollectionOverridable <NSObject>
- (UITraitCollection *) preferredTraitCollection;
@end
@interface CustomNavigationController : UINavigationController
@property (nonatomic, weak) id <TraitCollectionOverridable> traitsDelegate;
@end
.m文件
@implementation CustomNavigationController
- (void)viewDidLoad {
[super viewDidLoad];
[self.traitsDelegate preferredTraitCollection];
// Do any additional setup after loading the view.
}
- (UITraitCollection *)overrideTraitCollectionForChildViewController:(UIViewController *)childViewController
{
if (CGRectGetWidth(self.view.bounds) < CGRectGetHeight(self.view.bounds)) {
return [UITraitCollection traitCollectionWithHorizontalSizeClass:UIUserInterfaceSizeClassCompact];
} else {
return [UITraitCollection traitCollectionWithHorizontalSizeClass:UIUserInterfaceSizeClassRegular];
}
}
@end
我的猜测是overrideTraitCollectionForChildViewController没有正确转换。 任何帮助都会很棒。
我的猜测是overrideTraitCollectionForChildViewController没有正确转换。
overrideTraitCollectionForChildViewController
的Obj-C和Swift版本不等效。 这是更正的代码:
- (UITraitCollection *)overrideTraitCollectionForChildViewController:(UIViewController *)childViewController
{
if( [childViewController conformsToProtocol:@protocol(TraitCollectionOverridable)] ) {
return [(NSObject<TraitCollectionOverridable>*)childViewController preferredTraitCollection];
} else {
return [super overrideTraitCollectionForChildViewController:childViewController];
}
}
override func overrideTraitCollectionForChildViewController(childViewController: UIViewController) -> UITraitCollection? {
guard let conformingViewController = childViewController as? TraitCollectionOverridable else {
return super.overrideTraitCollectionForChildViewController(childViewController)
}
return conformingViewController.preferredTraitCollection()
}
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