iPhone开发之九宫格实现（一）

总体思路：用图片定位。

//
//  ViewController.m
//  SquaresDemo
//
//  Created by Fox on 12-3-21.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//

#import "ViewController.h"
#import "NextView.h"

NextView *nextView;

@implementation ViewController


- (void)viewDidLoad
{
    [super viewDidLoad];
    //将每个图片作为一格，通过控制它的位置来实现九宫格。
    NSArray* imageNames = [NSArray arrayWithObjects:
                           @"1.png", 
                           @"1.png", 
                           @"1.png",
                           @"1.png", 
                           @"1.png",
                           @"1.png", 
                           @"1.png", 
                           @"1.png", 
                           @"1.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];
        
    }
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

//响应按钮事件
-(void)btnPressed:(id)sender{
    NSLog(@"btnpress!");
    UIButton *Btn = (UIButton *)sender;
    int index = Btn.tag;
    
    switch (index) {
        case 0:
            NSLog(@"2222");
            if(nextView==nil)
                nextView = [[NextView alloc]init];
            [self.navigationController pushViewController:nextView animated:YES];
            break;
            //其他几个控制器类似
        default:
            if(nextView==nil)
                nextView = [[NextView alloc]init];
            [self.navigationController pushViewController:nextView animated:YES];
            
    }
    
}

@end