Application Bundleからのファイルの読み込み方法

NSString *filePath = [[NSBundle mainBundle] pathForResource:@"important" ofType:@"txt"]; 
if (filePath) { 
    NSString *myText = [NSString stringWithContentsOfFile:filePath]; 
    if (myText) { 
        textView.text= myText; 
    }
}