iPhone的九宫格实现代码

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