如何使用自定義UINavigationBar

Question

我有UINavigationBar的子類。

@interface MyNavigationBar : UINavigationBar 

做了一些改動，現在想的是我的應用程序NavigationController會使用它：

_navigationController = [[UINavigationController alloc] initWithRootViewController:self.viewController]; 
[_window addSubview:[_navigationController view]]; 
[self.window makeKeyAndVisible]; 

我想那_ navigationController將有MyNavigationBar

怎麼可以這樣做？

謝謝。

Answer 1

你必須創建一個有一個UINavaigationController一個廈門國際銀行。然後，您可以在Interface Builder中選擇navigationBar，然後將該類更改爲您的子類UINavigationBar。

然後使這個更容易一些實例我添加類別爲'UINavigationController的，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 

在類的使用它可以確保導入類別中的頂級我的情況下，它看起來像

#import "UINavigationController+DSCNavigationController" 

然後用它看起來像

MyViewController *myViewController = [[MyViewController alloc] init]; 
UINavigationController *navigationController = [UINavigationController dsc_navigationControllerWithRootViewController:myViewController]; 

Answer 2

的UINavigationController有一個只讀屬性

@property(nonatomic, readonly) UINavigationBar *navigationBar 

，因爲它是隻讀的，你必須繼承UINavigationBar的和覆蓋此屬性或使其讀write.E.g。 ：

MyNaviagtionBar *myBar = [[MyNavigationBar alloc] init]; 
_navigationController.navigationBar = mybar; 

或者子類：

MyNavigationController.h

@class MyNavigationBar; 

@interface MyNavigationController : UINavigationController 
@property(nonatomic, strong) MyNavigationBar *navigationBar; 
@end 

MyNavigationController.m

@implementation MyNavigationController 
@synthesize navigationBar = _navigationBar; 
@end 

，然後改變

_navigationController = [[UINavigationController alloc] initWithRootViewController:self.viewController]; 

到

_navigationController = [[MyNavigationController alloc] initWithRootViewController:self.viewController];