[英]How to wire custom UINavigationBar to UINavigationController
[英]How to use custom UINavigationBar
我有UINavigationBar
的子類。
@interface MyNavigationBar : UINavigationBar
進行了一些更改,現在希望我的應用程序NavigationController
使用它:
_navigationController = [[UINavigationController alloc] initWithRootViewController:self.viewController];
[_window addSubview:[_navigationController view]];
[self.window makeKeyAndVisible];
我希望_navigationController有MyNavigationBar
這怎么能做到?
謝謝。
您必須創建一個帶有UINavaigationController
的 xib。 然后,您可以 select Interface Builder 中的navigationBar
並將 class 更改為UINavigationBar
的子類。
然后為了讓它更容易實例化,我向`UINavigationController 添加了一個類別,例如:
@interface UINavigationController (DSCNavigationController)
+ (UINavigationController *)dsc_navigationControllerWithRootViewController:(UIViewController *)rootViewController;
@end
@implementation UINavigationController (DSCNavigationController)
+ (UINavigationController *)dsc_navigationControllerWithRootViewController:(UIViewController *)rootViewController;
{
NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"DSCNavigationController" owner:nil options:nil];
NSAssert(1 == [topLevelObjects count], @"DSCNavigationController should have one top level object");
UINavigationController *navigationController = [topLevelObjects objectAtIndex:0];
NSAssert([navigationController isKindOfClass:[UINavigationController class]], @"Should have a UINavigationController");
[navigationController pushViewController:rootViewController animated:NO];
return navigationController;
}
@end
在使用它的 class 的頂部,確保在我的案例中導入類別,它看起來像
#import "UINavigationController+DSCNavigationController"
然后使用它看起來像
MyViewController *myViewController = [[MyViewController alloc] init];
UINavigationController *navigationController = [UINavigationController dsc_navigationControllerWithRootViewController:myViewController];
UINavigationController 具有只讀屬性
@property(nonatomic, readonly) UINavigationBar *navigationBar
因為它是只讀的,所以您必須子類化 UINavigationBar 並覆蓋此屬性或使其成為可讀寫的。例如:
MyNaviagtionBar *myBar = [[MyNavigationBar alloc] init];
_navigationController.navigationBar = mybar;
或子類化:
我的導航控制器.h
@class MyNavigationBar;
@interface MyNavigationController : UINavigationController
@property(nonatomic, strong) MyNavigationBar *navigationBar;
@end
我的導航控制器.m
@implementation MyNavigationController
@synthesize navigationBar = _navigationBar;
@end
然后改變
_navigationController = [[UINavigationController alloc] initWithRootViewController:self.viewController];
到
_navigationController = [[MyNavigationController alloc] initWithRootViewController:self.viewController];
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