将字符串写入NSPasteBoard

我无法让这个方法返回YES:

- (BOOL) writeToPasteBoard:(NSString *)stringToWrite
{
    return [pasteBoard setString:stringToWrite forType:NSStringPboardType];
}

我已经验证stringToWrite正确通过,该方法总是返回NO.

有任何想法吗？

这是课程的其余部分:

@interface ClipBoard : NSObject {
    NSPasteboard *pasteBoard;
}

- (BOOL) writeToPasteBoard:(NSString *)stringToWrite;
- (NSString *) readFromPasteBoard;
@end

@implementation ClipBoard
- (id) init
{
    [super init];
    pasteBoard = [NSPasteboard generalPasteboard];
    return self;
}

- (BOOL) writeToPasteBoard:(NSString *)stringToWrite
{
    return [pasteBoard setString:stringToWrite forType:NSStringPboardType];
}

- (NSString *) readFromPasteBoard
{
    return [pasteBoard stringForType:NSStringPboardType];
}

@结束

1> macinjosh..：

---

以下是该方法的工作版本:

- (BOOL) writeToPasteBoard:(NSString *)stringToWrite
{
    [pasteBoard declareTypes:[NSArray arrayWithObject:NSStringPboardType] owner:nil];
    return [pasteBoard setString:stringToWrite forType:NSStringPboardType];
}

---

有时苹果的例子是匆匆写的或很久以前写的.他们提供的一些"示例代码"项目包含违反自然的罪行.事情发生了变化,陈旧的例子永远存在.:-)

---

您应该将nil用于对象指针,仅对非对象指针使用NULL.使用错误的读者会误导读者(从现在起六个月后你将是谁).

---

实际上这个代码片段来自Apple提供的示例.我认为他们会知道正确的做事方式.但我离题了,现在改为零.

2> Sebastian..：

---

斯威夫特2:

使用Swift 2将字符串复制到常规粘贴板:

let pasteboard = NSPasteboard.generalPasteboard()
pasteboard.declareTypes([NSPasteboardTypeString], owner: nil)
pasteboard.setString("Hello", forType: NSPasteboardTypeString)

3> Jason Fuerst..：

---

Apple建议人们远离NSStringPboardType并使用NSPasteboardTypeString.

4> Karsten..：

---

从10.6开始,以下实现也是可能的:

- (BOOL) writeToPasteBoard:(NSString *)stringToWrite
{
    [pasteBoard clearContents];
    return [pasteBoard writeObjects:[NSArray arrayWithObject:stringToWrite]];
}

重要的是要注意,在将新内容写入粘贴板之前必须调用#clearContents,否则#writeObjects:保持返回NO.

对于符合NSPasteboardWriting协议的对象,可以使用新的#writeObjects:方法.还有一个NSPasteboardReading协议,但使用它不会使实现更简单.

5> abdullahsele..：

---

在NSPasteboard上复制字符串之前,最好清除内容然后保存.

斯威夫特4

    // Set string
    NSPasteboard.general.clearContents()
    NSPasteboard.general.setString("I copied a string", forType: .string)
    // Read copied string
    NSPasteboard.general.string(forType: .string)

Objective-C的

    // Set string
    [[NSPasteboard generalPasteboard] clearContents];
    [[NSPasteboard generalPasteboard] setString:@"I copied a string" forType:NSPasteboardTypeString];
    // Read string
    [[NSPasteboard generalPasteboard] stringForType:NSPasteboardTypeString];

此外,还有其他可用类型用于在NSPasteboard上复制项目.喜欢:

NSPasteboardTypeString

NSPasteboardTypePDF

NSPasteboardTypeTIFF

NSPasteboardTypePNG

NSPasteboardTypeRTF

您可以在https://developer.apple.com/documentation/appkit/nspasteboardtype上找到更多详细信息.