Question

我是iOS开发的新手，我在过去2天遇到了问题我想在xcode4中创建，读取和写入.txt文件...请帮我作为完整的代码。热烈接受你的回答。感谢。

Answer 1

对于每个iOS应用程序，您只能在应用程序的文档目录中写入文件。这是一个示例代码。

//ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
@public

    NSString *filePath;
    NSString *fileData;    
    IBOutlet UITextView *textView;
}

@property (nonatomic, retain) NSString *filePath;
@property (nonatomic, retain) NSString *fileData;
@end





//ViewController.m

#import "ViewController.h"

@implementation ViewController

@synthesize filePath;
@synthesize fileData;

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.


    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [[NSString alloc] initWithFormat:@"%@", [paths objectAtIndex:0]];

    //define a file path
    filePath = [[NSString alloc] initWithFormat:@"%@", [documentsDirectory stringByAppendingPathComponent:@"YourFile.txt"]];    

    //check if file is exists or not then write some data
    NSFileManager *fileManager = [NSFileManager defaultManager];
    if(![fileManager fileExistsAtPath:filePath])
    {
        fileData = @"My name is maverick";
        [fileData writeToFile:filePath atomically:YES encoding:NSUnicodeStringEncoding error:nil];
        textView.text = fileData;
    }
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(IBAction)readFile:(id)sender
{
    fileData = [[NSString alloc] initWithContentsOfFile:filePath usedEncoding:nil error:nil];
    textView.text = fileData;
}

-(IBAction)writeFile:(id)sender
{
    fileData = textView.text;
    [fileData writeToFile:filePath atomically:YES encoding:NSUnicodeStringEncoding error:nil];
}

@end

如何在xcode 4中创建读/写.text文件？

1 个答案: