如何在文件夹中保存文件？ [英] How to save file in the documents folder?

问题描述

我正在尝试将数据保存在iPhone 5.1模拟器上的文档文件夹中。

I am trying to save data in the documents folder on iPhone 5.1 simulator.

 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [NSString stringWithFormat:@"%@/%@", documentsDirectory, @"myData.json"];

if ([[NSFileManager defaultManager] isWritableFileAtPath:filePath]) {
    NSLog(@"Writable");
}else {
    NSLog(@"Not Writable");
}

我总是不可写。
有什么想法吗？请帮助我。

I've got always "Not Writable". Any idea? Please help me.

推荐答案

可能因为您尚未创建文件，您测试的文件不存在。 ：）

Maybe because you have not created the file, the file you tested does not exist. :)

你可以这样做来发现问题，

You can do this to find the problem,

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [NSString stringWithFormat:@"%@/%@", documentsDirectory, @"myData.json"];
NSLog(@"filePath %@", filePath);

if (![[NSFileManager defaultManager] fileExistsAtPath:filePath]) { // if file is not exist, create it.
    NSString *helloStr = @"hello world";
    NSError *error;
    [helloStr writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:&error];
}

if ([[NSFileManager defaultManager] isWritableFileAtPath:filePath]) {
    NSLog(@"Writable");
}else {
    NSLog(@"Not Writable");
}

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