UIMenuController sharedMenuController - uicollectionview 的自定义菜单项不在 ios 7 中显示 [英] UIMenuController sharedMenuController - custom menuitem for uicollectionview do not show in ios 7
问题描述
我正在使用 UIMenuItem
在 UICollectionView
单元格长按中执行自定义操作.这与 iOS 6 完美配合,但现在我将我的应用程序转换为 iOS 7 和 Xcode 5,但它不起作用.自定义项目未显示.
I'm using a UIMenuItem
to perform a custom action in UICollectionView
cell long press.
this worked perfectly with iOS 6, but now I am converting my application to iOS 7 and Xcode 5 and it don't work. The custom item do not shown.
UIMenuItem *menuItem = [[UIMenuItem alloc] initWithTitle:@"Unfavorite"
action:@selector(unFavorite:)];
[[UIMenuController sharedMenuController] setMenuItems:[NSArray arrayWithObject:menuItem]];
[UIMenuController sharedMenuController].menuVisible = YES;
- (BOOL)collectionView:(UICollectionView *)collectionView canPerformAction:(SEL)action forItemAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender;
{
//do not show default itens like copy, paste....
[self becomeFirstResponder];
return NO;
}
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
// The selector(s) should match your UIMenuItem selector
if (action == @selector(unFavorite:)) {
return YES;
}
return NO;
}
- (void)collectionView:(UICollectionView *)collectionView
performAction:(SEL)action
forItemAtIndexPath:(NSIndexPath *)indexPath
withSender:(id)sender {
}
- (BOOL)collectionView:(UICollectionView *)collectionView
shouldShowMenuForItemAtIndexPath:(NSIndexPath *)indexPath {
myIndexPath = indexPath;
return YES;
}
推荐答案
我不知道iOS 6,但在iOS 7 中它非常简单.您只需要三个标准的集合视图委托菜单处理方法,以及单元子类中的一个操作方法.无需与第一响应者或类似的东西一起玩.因此,例如(在本例中,Copy 是标准项目,但 Capital 是我添加到菜单中的项目):
I don't know about iOS 6, but in iOS 7 it's very simple. You just need the three standard collection view delegate menu-handling methods, plus an action method in the cell subclass. There is no need to play with first responder or anything like that. So, for example (in this example, Copy is a standard item but Capital is something I've added to the menu):
// collection view delegate:
- (BOOL)collectionView:(UICollectionView *)collectionView
shouldShowMenuForItemAtIndexPath:(NSIndexPath *)indexPath {
UIMenuItem* mi = [[UIMenuItem alloc] initWithTitle:@"Capital"
action:NSSelectorFromString(@"capital:")];
[[UIMenuController sharedMenuController] setMenuItems:@[mi]];
return YES;
}
- (BOOL)collectionView:(UICollectionView *)collectionView
canPerformAction:(SEL)action
forItemAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender {
return (action == NSSelectorFromString(@"copy:") ||
action == NSSelectorFromString(@"capital:"));
}
- (void)collectionView:(UICollectionView *)collectionView
performAction:(SEL)action forItemAtIndexPath:(NSIndexPath *)indexPath
withSender:(id)sender {
// in real life, would do something here
NSString* state = (self.sectionData)[indexPath.section][indexPath.row];
if (action == NSSelectorFromString(@"copy:"))
NSLog(@"copying %@", state);
else if (action == NSSelectorFromString(@"capital:"))
NSLog(@"fetching the capital of %@", state);
}
// cell subclass:
-(void)capital:(id)sender {
// find my collection view
UIView* v = self;
do {
v = v.superview;
} while (![v isKindOfClass:[UICollectionView class]]);
UICollectionView* cv = (UICollectionView*) v;
// ask it what index path we are
NSIndexPath* ip = [cv indexPathForCell:self];
// talk to its delegate
if (cv.delegate &&
[cv.delegate respondsToSelector:
@selector(collectionView:performAction:forItemAtIndexPath:withSender:)])
[cv.delegate collectionView:cv performAction:_cmd
forItemAtIndexPath:ip withSender:sender];
}
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