写入UIImage和NSString

//
//  ViewController.h
//  写入UIImage和NSString
//
//  Created by jay on 15/12/6.
//  Copyright (c) 2015年 jay. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<UINavigationControllerDelegate,UIImagePickerControllerDelegate>


@end

//
//  ViewController.m
//  写入UIImage和NSString
//
//  Created by jay on 15/12/6.
//  Copyright (c) 2015年 jay. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
- (IBAction)pickerBtn:(UIButton *)sender;
@property (weak, nonatomic) IBOutlet UITextView *txt;

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
   
    NSArray *documents=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    
    NSString *path=[documents[0] stringByAppendingPathComponent:@"image.png"];
    
    UIImage *image=[UIImage imageNamed:path];
    
    if (image) {
        [self.imageView setImage:image];
    }
   
    NSString *strPath=[documents[0] stringByAppendingPathComponent:@"1.txt"];
    
    NSString *str=[NSString stringWithContentsOfFile:strPath encoding:NSUTF8StringEncoding error:nil];
    
    if (str) {
        [self.txt setText:str];
    }
    
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

- (IBAction)pickerBtn:(UIButton *)sender
{
    //创建UIImagePickerController
    UIImagePickerController *imagePicker=[[UIImagePickerController alloc]init];
    //被选择的照片来源
    [imagePicker setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
    //开启编辑模式
    [imagePicker setAllowsEditing:YES];
    
    //设置代理
    [imagePicker setDelegate:self];
    
    //显示UIImagePickerController
    [self presentViewController:imagePicker animated:YES completion:nil];
    
}
#pragma mark-选择完照片后回调
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    NSLog(@"%@",info);
    
    //UIImagePickerControllerOriginalImage
    //得到选择的图片
    UIImage *image=info[@"UIImagePickerControllerOriginalImage"];
    //设置UIImageView图片内容
    [self.imageView setImage:image];
    //获取沙盒内的document目录
    NSArray *documents=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    //构建文件路径
    NSString *path=[documents[0] stringByAppendingPathComponent:@"image.png"];
    //将图片转化为二进制数据
    NSData *imageData=UIImagePNGRepresentation(image);
    //将文件写到沙盒内的document目录里
    [imageData writeToFile:path atomically:YES];
    
    NSString *str=@"我爱你！";
    
    NSString *strPath=[documents[0] stringByAppendingPathComponent:@"1.txt"];
    
    [str writeToFile:strPath atomically:YES encoding:NSUTF8StringEncoding error:nil];
    
    //关闭图片选择控制器
    [picker dismissViewControllerAnimated:YES completion:nil];
    
    NSLog(@"%@",path);
}
@end