按下自定义项UICollectionViewCell图像更改
按下自定义项UICollectionViewCell图像更改
提问于 2013-01-03 13:42:48
如何使细胞图像在长按压手势后发生变化？
在这里，当我点击一个单元格(长按压)时，会出现4个定制的项目，但当我选择其中一个时，应用程序就会崩溃。(如果删除：(单元格*)单元格和cell.imageView.image = [UIImage imageNamed:NSString NSString works：@“ICUbedRED.png”]；它可以工作.我的意思是显示alertView，但图像当然不会改变)。
- (void)longPress:(UILongPressGestureRecognizer *)recognizer {
if (recognizer.state == UIGestureRecognizerStateBegan) {
Cell *cell = (Cell *)recognizer.view;
[cell becomeFirstResponder];
UIMenuItem *highDep = [[UIMenuItem alloc] initWithTitle:@"High Dependency" action:@selector(hiDep:)];
UIMenuItem *lowDep = [[UIMenuItem alloc] initWithTitle:@"Low Dependency" action:@selector(lowDep:)];
UIMenuItem *booked = [[UIMenuItem alloc] initWithTitle:@"Booked" action:@selector(booked:)];
UIMenuItem *free = [[UIMenuItem alloc] initWithTitle:@"Free" action:@selector(free:)];
UIMenuController *menu = [UIMenuController sharedMenuController];
[menu setMenuItems:[NSArray arrayWithObjects:booked, highDep, lowDep, free, nil]];
[menu setTargetRect:cell.frame inView:cell.superview];
[menu setMenuVisible:YES animated:YES];
}
}空白处是：
- (void)hiDep:(Cell*)cell
{
NSLog(@"Bed is HiDep");
cell.imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"ICUbedRED.png"]];
UIAlertView *testAlert = [[UIAlertView alloc] initWithTitle:@"This Bed is High Dependency"
message:@""
delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
[testAlert show];
[testAlert release];
}
- (void)lowDep:(Cell*)cell
{.
cell.imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"ICUbedYELLOW.png"]];
..}
- (void)free:(Cell*)cell
{..
cell.imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"ICUbedGREEN.png"]];
.}
- (void)booked:(Cell*)cell
{..
cell.imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"ICUbedBLUE.png"]];
.}而构建单元的方法是：
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
static NSString *identifier = @"Cell";
Cell *cvc = (Cell *)[collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
int i = indexPath.row%[labelArray count];
number = i;
UILongPressGestureRecognizer *recognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
[cvc addGestureRecognizer:recognizer];
cvc.imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"icubed.png"]];
cvc.label.text = [labelArray objectAtIndex:number];
return cvc;
}回答 1
Stack Overflow用户
发布于 2013-01-25 09:22:20
@dottor自我感觉好极了
cell.imageView.image = [UIImage imageNamed:[NSString stringWi......因为，对象被重新定义为param方法，如
- (Void)lowDep：( Cell *)单元不属于类单元，所述的param属于UIMenuItem类。因为您单击的是menuItems，而不是单元格。
在默认情况下，您可以在由MenuItems提供的UICollectionCell解决方案上使用UICollectionView和相应的操作，而不是现在正在做的事情。您可以查看本教程这里！
只需实现3个委托方法和
// These methods provide support for copy/paste actions on cells.
// All three should be implemented if any are.
- (BOOL)collectionView:(UICollectionView *)collectionView shouldShowMenuForItemAtIndexPath:(NSIndexPath *)indexPath;
- (BOOL)collectionView:(UICollectionView *)collectionView canPerformAction:(SEL)action forItemAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender;
- (void)collectionView:(UICollectionView *)collectionView performAction:(SEL)action forItemAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender;并将您的自定义menuItems设置为ViewdidLoad中的sharedMenuController。
希望这有帮助，原谅我的错误句子形成。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/14140093
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