我实际上对iOS7中用于在UITableView上显示自定义上下文菜单的更改感到有些困惑。
我的代码如下:
- (void)viewDidLoad {
UIMenuItem *deleteAction = [[UIMenuItem alloc]initWithTitle:NSLocalizedString(@"Delete", nil) action:@selector(delete:)];
UIMenuItem *renameAction = [[UIMenuItem alloc]initWithTitle:NSLocalizedString(@"Rename", nil) action:@selector(rename:)];
UIMenuController* mc = [UIMenuController sharedMenuController];
mc.menuItems = [NSArray arrayWithObjects: renameAction, deleteAction, nil];
[mc setTargetRect:CGRectMake(50.0, 50.0, 0, 0) inView:self.view];
[mc setMenuVisible:YES animated:YES];
[mc setMenuItems:@[deleteAction, renameAction]];
[self becomeFirstResponder];
-(void)tableView:(UITableView*)tableView performAction:(SEL)action forRowAtIndexPath:(NSIndexPath*)indexPath withSender:(id)sender{
}
-(BOOL)tableView:(UITableView*)tableView canPerformAction:(SEL)action forRowAtIndexPath:(NSIndexPath*)indexPath withSender:(id)sender {
if (tableView != nil && indexPath != nil)
{
if (action == @selector(delete:)) {
return YES;
}
if (action == @selector(rename:)) {
return YES;
}
}
return NO;
}
-(BOOL)tableView:(UITableView*)tableView shouldShowMenuForRowAtIndexPath:(NSIndexPath*)indexPath {
return YES;
}
我的问题是,在iOS的预览版本中一切正常。如果用户长按表视图的单元格,则会显示自定义上下文菜单,但在 iOS7 中没有任何反应。这些方法被调用,但未显示任何内容。
UIMenuController 有一个人们总是错过的小问题。
要显示菜单,目标视图必须位于响应程序链中。默认情况下,许多 UIKit 视图无法成为响应者,因此您需要对它们进行子类化,以便为 canBecomeFirstResponder 返回 YES。
-(BOOL)canBecomeFirstResponder {
return YES;
}
- (void)menuDelete:(id)sender {
NSLog(@"delete");
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
NSLog(@"touchesBegan");
[self becomeFirstResponder];
UIMenuItem *menuItem = [[UIMenuItem alloc] initWithTitle:@"Delete" action:@selector(menuDelete:)];
UIMenuController *menuCont = [UIMenuController sharedMenuController];
[menuCont setTargetRect:self.frame inView:self.superview];
menuCont.menuItems = [NSArray arrayWithObject:menuItem];
[menuCont setMenuVisible:YES animated:YES];
}
我希望这有所帮助。我很乐意帮助解决更多问题,因此,如果我的建议仍然不能解决问题,请随时提供更新。