1 //CustomNavigationBar.h
2 @interface UINavigationBar (UINavigationBarCategory)
3 UIImageView *backgroundView;
4 - (void)setBackgroundImage:(UIImage*)image;
5 - (void)insertSubview:(UIView *)view atIndex:(NSInteger)index;
6 @end
7 //CustomNavigationBar.m
8 @implementation UINavigationBar (UINavigationBarCategory)
9 -(void)setBackgroundImage:(UIImage*)image
10 { if(image == nil)
11 { [backgroundView removeFromSuperview]; }
12 else { backgroundView = [[UIImageView alloc] initWithImage:image];
13 backgroundView.tag = 1;
14 backgroundView.frame = CGRectMake(0.f, 0.f, self.frame.size.width, self.frame.size.height);
15 backgroundView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; [self addSubview:backgroundView];
16 [self sendSubviewToBack:backgroundView];
17 [backgroundView release];
18 }
19 }
20 //for other views
21 - (void)insertSubview:(UIView *)view atIndex:(NSInteger)index
22 {
23 [super insertSubview:view atIndex:index];
24 [self sendSubviewToBack:backgroundView];
25 }
26 @end
27 //YourViewController.m
28 - (void)viewWillAppear:(BOOL)animated
29 {
30 [super viewWillAppear:animated];
31 [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"navigation_bar_bg.png"]];
32 }
33 Objective-c代码
34 //CustomNavigationBar.h
35 @interface UINavigationBar (UINavigationBarCategory)
36 UIImageView *backgroundView;
37 - (void)setBackgroundImage:(UIImage*)image;
38 - (void)insertSubview:(UIView *)view atIndex:(NSInteger)index;
39 @end
40 //CustomNavigationBar.m
41 @implementation UINavigationBar (UINavigationBarCategory)
42 -(void)setBackgroundImage:(UIImage*)image {
43 if(image == nil) {
44 [backgroundView removeFromSuperview];
45 } else {
46 backgroundView = [[UIImageView alloc] initWithImage:image];
47 backgroundView.tag = 1;
48 backgroundView.frame = CGRectMake(0.f, 0.f, self.frame.size.width, self.frame.size.height);
49 backgroundView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
50 [self addSubview:backgroundView];
51 [self sendSubviewToBack:backgroundView];
52 [backgroundView release];
53 }
54 }
55 //for other views
56 - (void)insertSubview:(UIView *)view atIndex:(NSInteger)index
57 {
58 [super insertSubview:view atIndex:index];
59 [self sendSubviewToBack:backgroundView];
60 }
61 @end
62 //YourViewController.m
63 - (void)viewWillAppear:(BOOL)animated
64 {
65 [super viewWillAppear:animated];
66 [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"navigation_bar_bg.png"]];
67 }
