读取保存plist文件

@implementation SettingUtil

+ (NSString *)dataFilePath{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    return [documentsDirectory stringByAppendingPathComponent:@"config.plist"];
}

+(NSMutableDictionary *)loadFromFile {
    NSString *error = nil;
    NSPropertyListFormat format;
    NSMutableDictionary *dict = nil;
    NSString *filePath = [self dataFilePath];
    if (![[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
        filePath = [[NSBundle mainBundle] pathForResource:@"config" ofType:@"plist"];
    }
    NSData *plistXML = [[NSFileManager defaultManager] contentsAtPath:filePath];
    dict = (NSMutableDictionary *)[NSPropertyListSerialization propertyListFromData:plistXML
                                                                   mutabilityOption:NSPropertyListMutableContainersAndLeaves
                                                                             format:&format
                                                                   errorDescription:&error];
    return dict;
}

+(BOOL)saveToFile:(NSMutableDictionary *)withData {
    NSString *error = nil;
    NSData    *plistData = [NSPropertyListSerialization dataFromPropertyList:withData format:NSPropertyListXMLFormat_v1_0 errorDescription:&error];
    if(plistData) {
        return [plistData writeToFile:[self dataFilePath] atomically:YES];
    } else {
        return FALSE;
    }
}