很多开发者会在 iPhone 软件里用到手机上经典的九宫格界面，本段实现九宫格的代码由 CocoaChina 会员“花太香齐” 分享，博客原文地址 

核心就这2个方法:

//Power by ieliwb.com

- (void)viewDidLoad {

    [super viewDidLoad];

    NSArray* imageNames = [NSArray arrayWithObjects

                                        @"ico_mobile.png",

                                        @"ico_idcard.png",

                                        @"ico_postcode.png",

                                        @"ico_flight.png",

                                        @"ico_translate.png",

                                        @"ico_phone.png",

                                        @"ico_car.png",

                                        @"ico_health.png",

                                        @"ico_bjxm.png", nil];

    UIButton *Btn;

    for (int i=0; i<9; i++) {

        CGRect frame;

        Btn = [[UIButton buttonWithType:UIButtonTypeCustom] retain];

        [Btn setImage:[UIImage imageNamed:[imageNames objectAtIndex: i]] forState:UIControlStateNormal];//设置按钮图片

        Btn.tag = i;

        frame.size.width = 59;//设置按钮坐标及大小

        frame.size.height = 75;

        frame.origin.x = (i%3)*(59+32)+40;

        frame.origin.y = floor(i/3)*(75+24)+40;

        [Btn setFrame:frame];

        [Btn setBackgroundColor:[UIColor clearColor]];

        [Btn addTarget:self action:@selector(btnPressed:) forControlEvents:UIControlEventTouchUpInside];

        [self.view addSubview:Btn];

        [Btn release];

    }

}

//响应按钮事件

-(void)btnPressed:(id)sender{

    UIButton *Btn = (UIButton *)sender;

        int index = Btn.tag;

    switch (index) {

        case 0:

            if(mobileController==nil)

                mobileController = [[MobileController alloc]init];

            [self.navigationController pushViewController:mobileController animated:YES];

            break;

        //其他几个控制器类似

    }

}

 

九宫格背景修改可以这样实现:

- (void)loadView {

    UIImageView *contentView = [[UIImageView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];

    [contentView setImage:[UIImage imageNamed:@"subview_9_bg.png"]];

    [contentView setUserInteractionEnabled:YES];

    self.view = contentView;

    [contentView release];

}

 

UINavigationBar背景图片可以这样实现:

@implementation UINavigationBar (CustomImage)

- (void)drawRect:(CGRect)rect {

    UIImage *image = [UIImage imageNamed: @"top_bg.png"]

    [image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];

}

@end