在UITextField上启用复制和粘贴，而不使其可编辑 [英] Enable copy and paste on UITextField without making it editable

问题描述

我希望 UITextField （或者理想情况下， UILabel ）中的文本为

I want the text in a UITextField (or ideally, a UILabel) to be non-editable, but at the same time give the user the ability to copy and paste it.

推荐答案

我的最终解决方案是可编辑的，但同时给予用户复制和粘贴它的能力。是以下：

My final solution was the following:

我创建了一个UILabel的子类（UITextField应该工作相同），在被点击后显示一个UIMenuController。 CopyableLabel.m如下所示：

I created a subclass of UILabel (UITextField should work the same) that displays a UIMenuController after being tapped. CopyableLabel.m looks like this:

@implementation CopyableLabel


- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
if(action == @selector(copy:)) {
    return YES;
}
else {
    return [super canPerformAction:action withSender:sender];
}
}


- (BOOL)canBecomeFirstResponder {
return YES;
}


- (BOOL)becomeFirstResponder {
if([super becomeFirstResponder]) {
    self.highlighted = YES;
    return YES;
}
return NO;
}


- (void)copy:(id)sender {
UIPasteboard *board = [UIPasteboard generalPasteboard];
[board setString:self.text];
self.highlighted = NO;
[self resignFirstResponder];
}


- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
if([self isFirstResponder]) {
    self.highlighted = NO;
    UIMenuController *menu = [UIMenuController sharedMenuController];
    [menu setMenuVisible:NO animated:YES];
    [menu update];
    [self resignFirstResponder];
}
else if([self becomeFirstResponder]) {
    UIMenuController *menu = [UIMenuController sharedMenuController];
    [menu setTargetRect:self.bounds inView:self];
    [menu setMenuVisible:YES animated:YES];
}
}


@end

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