iphone - 如何在 objective-c iphone的文本文件中写入内容

我正在 iPhone 中编写内容。我用了这段代码

NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES);
NSString *filePath = [[paths objectAtIndex:0]stringByAppendingPathComponent"data.txt"];
NSString *temp = [[NSString alloc] initWithString"my name is gaurav"];
[temp writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:nil];
[temp release];

当我试图用这段代码用新内容覆盖这个文件时

NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES);
NSString *filePath = [[paths objectAtIndex:0]stringByAppendingPathComponent"data.txt"];
NSString *matter = [[NSString alloc] initWithString"Hello iPhone"];

[matter writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:nil];
[matter release];

如果我以原子方式传递 YES，则文件不会被覆盖。如果我在那里放置了否，则文件将被覆盖，但程序也会停止并退出。

[matter writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:nil];

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Best Answer-推荐答案

我试过了。这是工作。您只需创建测试项目。并在 viewDidLod 方法中编写以下代码。并从文档目录中查看文本文件内容。它将被覆盖。

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

    NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *filePath = [[paths objectAtIndex:0]stringByAppendingPathComponent"data.txt"];
    NSString *temp = [[NSString alloc] initWithString"my name is gaurav"];
    [temp writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:nil];
    [temp release];

    NSString *matter = [[NSString alloc] initWithString"Hello iPhone"];
    [matter writeToFile:filePath atomically:NO encoding:NSUTF8StringEncoding error:nil];
    [matter release];

}

关于iphone - 如何在 objective-c iphone的文本文件中写入内容，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/8645237/