ios - NSURL 没有可见的@interface 声明选择器组件separatedbystring

Question

NSArray 声明引发错误，因为“NSURL 的不可见@interface 声明了选择器组件separatedbytring”。

NSURL *MyURL = [[NSBundle mainBundle]
                 URLForResource: @"artList" withExtension:@"txt"];
NSArray *lines = [MyURL componentsSeparatedByString:@"\n"]; // each line, adjust character for line endings

for (int i = 0; i < 10; i++) {
    NSString *line;
    //in lines;
    NSLog(@"%@", [NSString stringWithFormat:@"line: %@", line]);
    _wordDefBox.text = [NSString stringWithFormat:@"%@%@",_wordDefBox.text, lines];
}

Answer 1

你错过了一步。获得 URL 后，您需要将文件加载到 NSString 中。然后在 NSString 上调用 componentsSeparatedByString。

NSURL *myURL = [[NSBundle mainBundle]
                 URLForResource: @"artList" withExtension:@"txt"];
NSError *error = nil;
// Use the appropriate encoding for your file
NSString *string = [NSString stringWithContentsOfURL:myURL encoding:NSUTF8StringEncoding error:&error];
if (string) {
    NSArray *lines = [string componentsSeparatedByString:@"\n"];
    // and the rest
} else {
    NSLog(@"Unable to load string from %@: %@", myURL, error);
}