ios JSON 解析流程（转）

转自：http://blog.csdn.net/linzhiji/article/details/6833884

.h文件

#import <UIKit/UIKit.h>
#import "JSONKit.h"

@interface MainViewController : UIViewController
{
	UIButton *btn;
}
@end

.m文件

//
//  MainViewController.m
//  testapple
//
//  Created by kiri on 12-5-8.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//

#import "MainViewController.h"

@implementation MainViewController


#pragma mark - View lifecycle
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
	[super loadView];
	self.navigationController.navigationBar.hidden = NO;
	self.title = @"测试";
	btn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 40)];
	[btn setBackgroundImage:[UIImage imageNamed:@"btnoff.png"] forState:UIControlStateNormal];
	[btn setBackgroundImage:[UIImage imageNamed:@"btnon.png"] forState:UIControlStateHighlighted];
	[btn addTarget:self action:@selector(onbuttonclick) forControlEvents:UIControlEventTouchUpInside];
	[self.view addSubview:btn];
}



// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    [super viewDidLoad];
}

-(void)onbuttonclick
{
	NSLog(@"onbuttonclick");
	NSString *jsonstring = @"[{\"age\":18,\"book\":{\"price\":23.2,\"title\":\"booooooook1\"},\"name\":\"samyou\"},{\"age\":22,\"book\":{\"price\":21,\"title\":\"booooooook2\"},\"name\":\"samsam\"}]";
	NSData *data = [jsonstring dataUsingEncoding:NSUTF8StringEncoding];
	NSArray *arr = (NSArray *)[data mutableObjectFromJSONData];
	NSLog(@"count=%d",arr.count);
	for(int i=0;i<arr.count;i++)
	{
		NSDictionary *people = [arr objectAtIndex:i];
		NSString *name = [people objectForKey:@"name"];
		NSNumber *age = [people objectForKey:@"age"];
		NSLog(@"person withname=%@,age = %d",name,[age intValue]);
		NSDictionary *book = [people objectForKey:@"book"];
		NSString *bookname = [book objectForKey:@"title"];
		NSNumber *price = [book objectForKey:@"price"];
		NSLog(@"book with title=%@, price=%f",bookname,[price doubleValue]);
	}
	
}

-(void)dealloc
{
	[btn release];
	[super dealloc];
}

@end

 

点击按钮得出的结果

2012-09-21 14:26:33.763 testapple[2922:c07] onbuttonclick

2012-09-21 14:26:33.764 testapple[2922:c07] count=2

2012-09-21 14:26:33.764 testapple[2922:c07] person withname=samyou,age = 18

2012-09-21 14:26:33.764 testapple[2922:c07] book with title=booooooook1, price=23.200000

2012-09-21 14:26:33.765 testapple[2922:c07] person withname=samsam,age = 22

2012-09-21 14:26:33.765 testapple[2922:c07] book with title=booooooook2, price=21.000000