摘要：
#pragma mark 清空字符串中的空白字符- (NSString *)trimString{ return [self stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];}#pragma mark 是否空字符串- (BOOL)isEmptyString{ return (self == nil || self.length == 0);}#pragma mark 返回沙盒中的文件路径- (NSString *)documentsPath{ NSString... 阅读全文