我在这样的UIMenuController
中显示自定义tableview
但是问题是它显示在中间,我想在橙色的label
顶部显示它。为了在label
上显示,我在下面执行了此[menu setTargetRect:CGRectMake(10, 10, 0, 0) inView:self.lbl];
,即整个代码。
但是,如果我在不显示UIMenuController
的情况下显示UITableView
,则setTargetRect
可以正常工作。
为什么setTargetRect
不能与UITableView
一起使用?
setTargetRect Doc说:
我想念的是什么?
MyViewController
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return 5;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
TheCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cid" forIndexPath:indexPath];
cell.lbl.text = [NSString stringWithFormat:@"%ld", (long)indexPath.row];
return cell;
}
- (BOOL)tableView:(UITableView *)tableView shouldShowMenuForRowAtIndexPath:(NSIndexPath *)indexPath {
return YES;
}
-(BOOL)tableView:(UITableView *)tableView canPerformAction:(SEL)action forRowAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender {
return YES;
}
- (void)tableView:(UITableView *)tableView performAction:(SEL)action forRowAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender {
// required
}
MyCustomCell
- (void)awakeFromNib {
// Initialization code
UIMenuItem *testMenuItem = [[UIMenuItem alloc] initWithTitle:@"Test" action:@selector(test:)];
UIMenuController *menu = [UIMenuController sharedMenuController];
[menu setMenuItems: @[testMenuItem]];
[menu setTargetRect:CGRectMake(10, 10, 0, 0) inView:self.lbl];
[menu update];
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
-(BOOL) canPerformAction:(SEL)action withSender:(id)sender {
return (action == @selector(copy:) || action == @selector(test:));
}
/// this methods will be called for the cell menu items
-(void) test: (id) sender {
NSLog(@"test");
}
-(void) copy:(id)sender {
UIMenuController *m = sender;
NSLog(@"copy");
}
最佳答案
1)首先,请在您的 View Controller 的viewDidLoad
方法中执行此操作。
UIMenuItem *testMenuItem = [[UIMenuItem alloc] initWithTitle:@"Test"
action:@selector(test:)];
[[UIMenuController sharedMenuController] setMenuItems: @[testMenuItem]];
[[UIMenuController sharedMenuController] update];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(menuControllerWillShow:) name:UIMenuControllerWillShowMenuNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(menuControllerWillHide:) name:UIMenuControllerWillHideMenuNotification object:nil];
2)然后,添加这两个方法。并将
menuFrame inView
设置为您的单元格-(void)menuControllerWillShow:(NSNotification *)notification{
//Remove Will Show Notification to prevent
// "menuControllerWillShow" function to be called multiple times
[[NSNotificationCenter defaultCenter]removeObserver:self name:UIMenuControllerWillShowMenuNotification object:nil];
//Hide the Original Menu View
UIMenuController* menuController = [UIMenuController sharedMenuController];
CGSize size = menuController.menuFrame.size;
CGRect menuFrame;
menuFrame.origin.x = self.tableView.frame.origin.x;
menuFrame.size = size;
[menuController setMenuVisible:NO animated:NO];
//Modify its target rect and show it again to prevent glitchy appearance
[menuController setTargetRect:menuFrame inView:cell];
[menuController setMenuVisible:YES animated:YES];
}
-(void)menuControllerWillHide:(NSNotification *)notification{
//re-register menuControllerWillShow
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(menuControllerWillShow:)
name:UIMenuControllerWillShowMenuNotification object:nil];
}
3)实现tableView委托(delegate)并实现这些方法。
- (BOOL)tableView:(UITableView *)tableView shouldShowMenuForRowAtIndexPath:(NSIndexPath *)indexPath {
cell = (TableViewCell*)[tableView cellForRowAtIndexPath:indexPath];
return YES;
}
-(BOOL)tableView:(UITableView *)tableView canPerformAction:(SEL)action forRowAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender {
return NO;
}
- (void)tableView:(UITableView *)tableView performAction:(SEL)action forRowAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender {
// required
}
4)使用以下命令设置单元格(子类化UITableViewCell)
-(BOOL) canPerformAction:(SEL)action withSender:(id)sender {
return (action == @selector(copy:) || action == @selector(test:)); } /// this methods will be called for the cell menu items
-(void) test: (id) sender {
NSLog(@"test"); }
-(void) copy:(id)sender {
NSLog(@"copy"); }