复制粘贴功能

样式：

- (void)awakeFromNib{   // 给Label添加手机    [self addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(labelClick)]];}-  (void)initWithFrame:(CGRect)rect{   if(self = [super initWithFrame:rect]){      // 给Label添加手机       [self addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(labelClick)]];   }}- (void)labelClick{    // 让label成为第一响应者    [self becomeFirstResponder];    // 获得菜单    UIMenuController *menu = [UIMenuController sharedMenuController];    // 设置菜单内容，显示中文，所以要手动设置app支持中文    menu.menuItems = @[                       [[UIMenuItem alloc] initWithTitle:@"顶" action:@selector(ding:)],                       [[UIMenuItem alloc] initWithTitle:@"回复" action:@selector(reply:)],                       [[UIMenuItem alloc] initWithTitle:@"举报" action:@selector(warn:)]                       ];    // 菜单最终显示的位置    [menu setTargetRect:self.bounds inView:self];    // 显示菜单    [menu setMenuVisible:YES animated:YES];}#pragma mark - UIMenuController相关/** * 让Label具备成为第一响应者的资格 */- (BOOL)canBecomeFirstResponder{    return YES;}/** * 通过第一响应者的这个方法告诉UIMenuController可以显示什么内容 */- (BOOL)canPerformAction:(SEL)action withSender:(id)sender{    if ( (action == @selector(copy:) && self.text) // 需要有文字才能支持复制        || (action == @selector(cut:) && self.text) // 需要有文字才能支持剪切        || action == @selector(paste:)        || action == @selector(ding:)        || action == @selector(reply:)        || action == @selector(warn:)) return YES;    return NO;}#pragma mark - 监听MenuItem的点击事件- (void)cut:(UIMenuController *)menu{    // 将label的文字存储到粘贴板    [UIPasteboard generalPasteboard].string = self.text;    // 清空文字    self.text = nil;}- (void)copy:(UIMenuController *)menu{    // 将label的文字存储到粘贴板    [UIPasteboard generalPasteboard].string = self.text;}- (void)paste:(UIMenuController *)menu{    // 将粘贴板的文字赋值给label    self.text = [UIPasteboard generalPasteboard].string;}- (void)ding:(UIMenuController *)menu{    NSLog(@"%s %@", __func__, menu);}- (void)reply:(UIMenuController *)menu{    NSLog(@"%s %@", __func__, menu);}- (void)warn:(UIMenuController *)menu{    NSLog(@"%s %@", __func__, menu);}@end