1. 创建 UILabel 的子类
@interface YYCopyLabel : UILabel
@property (nonatomic, assign) BOOL copyEnabled;
@end
2. 增加 UILongPressGestureRecognizer 手势
- (void)setCopyEnabled:(BOOL)copyEnabled
{
_copyEnabled = copyEnabled;
// 确保 UILabel 可交互
self.userInteractionEnabled = copyEnabled;
if (copyEnabled && !self.longPressGR) {
self.longPressGR = [[UILongPressGestureRecognizer alloc] initWithTarget:self
action:@selector(handleLongPressGesture:)];
[self addGestureRecognizer:self.longPressGR];
}
if (self.longPressGR) {
self.longPressGR.enabled = copyEnabled;
}
}
- (void)handleLongPressGesture:(UILongPressGestureRecognizer *)longPressGR
{
if (longPressGR.state == UIGestureRecognizerStateBegan) {
[self becomeFirstResponder];
[[UIMenuController sharedMenuController] setTargetRect:self.frame inView:self.superview];
[[UIMenuController sharedMenuController] setMenuVisible:YES animated:YES];
}
}
3. 实现 UIMenuController 的相关协议
- (BOOL)canBecomeFirstResponder
{
return YES;
}
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
// 自定义响应UIMenuItem Action，例如你可以过滤掉多余的系统自带功能（剪切，选择等），只保留复制功能。
return (action == @selector(copy:));
}
- (void)copy:(id)sender
{
[[UIPasteboard generalPasteboard] setString:self.text];
}
4. 使用UIMenuController出现UIViewControllerHierarchyInconsistency crash
-
Exception log:
UICompatibilityInputViewController的父控制器必须是UIInputWindowController，不能是其他自定义的控制器。
'UIViewControllerHierarchyInconsistency', reason: 'child view controller:<UICompatibilityInputViewController: 0x7f9b37f00fa0> should have parent view controller:<ClipboardLabelViewController: 0x7f9b3b009b90> but requested parent is:<UIInputWindowController: 0x7f9b3801d400>'
-
崩溃原因：调用UIMenuController控制器的视图层级树(view tree)存在命名为inputView的view。上面例子是因为ClipboardLabelViewController 定义了inputView。
@property (nonatomic, strong) UIView *inputView;
-
解决办法：找出自定义inputView，修改其命名，例如你可以改成myInputView
