ios - 如何在 iOS 中向/从 UIPasteboard 写入和读取字符串值？

Question

我有以下测试，失败

NSString * expectedValue = @"achilles";

UIPasteboard *pasteboard = [UIPasteboard pasteboardWithName:@"pb1" create:YES];
pasteboard.persistent = YES;

pasteboard.string = expectedValue;    
STAssertEqualObjects(expectedValue, [pasteboard string], @"get written value from pasteboard");

[pasteboard setString:expectedValue];
STAssertEqualObjects(expectedValue, [pasteboard string], @"get written value from pasteboard");

两个断言都失败了，

'achilles' should be equal to '(null)'

我是在错误地写入粘贴板、从粘贴板读取，还是两者都有错误？

Answer 1

我假设问题如下:
UIPasteboard 的 string 属性定义为 ( see the docs )

@property(nonatomic, copy) NSString *string;  

这意味着如果您为其分配一个字符串，它将被复制，即创建一个新对象。当您读回并将其与原始对象进行比较时，比较一定会失败。