IOS MenuController初步了解
-
默认情况下有以下控件已经支持MenuController。
- UITextField
- UITextView
- UIWebView
-
让其他控件也支持MenuController
例如:UILabel
-
自定义label
- 重写两个方法
//允许自己成为第一响应者
- (BOOL)canBecomeFirstResponder{
return YES;
}
//Label能够执行哪些操作(menu)
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender{
if (action == @selector(copy:) || action == @selector(cut:)) {
return YES;
}
return NO;
}
- 实现各种操作方法
- (void)copy:(id)sender{
//复制版
UIPasteboard * paste = [UIPasteboard generalPasteboard];
paste.string = self.text;
}
- (void)cut:(id)sender{
UIPasteboard * paste = [UIPasteboard generalPasteboard];
paste.string = self.text;
self.text = nil;
}
- (void)paste:(id)sender{
UIPasteboard * paste = [UIPasteboard generalPasteboard];
self.text = paste.string;
}
- 让Label成为第一响应者
//让自己成为第一响应者
[self becomeFirstResponder];
- 显示MenuController
//初始化menu
UIMenuController * menu = [UIMenuController sharedMenuController];
//设置menu的显示位置
[menu setTargetRect:self.frame inView:self.superview];
//让menu显示并且伴有动画
[menu setMenuVisible:YES animated:YES];