objective-c - 使用 stringWithUTF8String 和 dataUsingEncoding 将 NSString 转换为 NSData 返回 nil

Question

当我将 NSString 转换为 NSData 并返回时，我得到零结果

NSString * test = @"Wft0r3qkzXd5TDBeCahUB3MtHuc8Axwr";

NSData * testData = [test dataUsingEncoding:NSUTF8StringEncoding];

NSString * result = [NSString stringWithUTF8String:[testData bytes]];

输出

Printing description of testData:
<57667430 7233716b 7a586435 54444265 43616855 42334d74 48756338 41787772>
Printing description of result:
<nil>

Answer 1

我相信您正在寻找这种方法:

- (instancetype)initWithData:(NSData *)data
                    encoding:(NSStringEncoding)encoding

来自苹果文档:NSString class reference