UICollectionVIew indexPath.item/row 返回不正确的值
UICollectionVIew indexPath.item/row returning incorrect value
这是我为 UICollectionView
编写的代码。在此 UICollectionView
中,我使用 UIButton
并且我想知道单击按钮的单元格的索引。在点击按钮时 indexPath.item/row
的值在变化,我没有得到正确的值。
- (void)viewDidLoad
{
[super viewDidLoad];
UICollectionViewFlowLayout *layout=[[UICollectionViewFlowLayout alloc] init];
frpCollectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height) collectionViewLayout:layout];
[frpCollectionView setDataSource:self];
[frpCollectionView setDelegate:self];
layout.minimumInteritemSpacing = 0;
layout.minimumLineSpacing = 0;
frpCollectionView.backgroundColor=[UIColor whiteColor];
[frpCollectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"cellIdentifier"];
[self.view addSubview:frpCollectionView];
[frpCollectionView mas_makeConstraints:^(MASConstraintMaker *make)
{
make.left.and.right.equalTo(self.view);
make.top.equalTo(self.view);
make.bottom.equalTo(self.view);
}];
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return frpTitleArray.count;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath;
{
frpCollectionViewCell = [frpCollectionView dequeueReusableCellWithReuseIdentifier:@"cellIdentifier" forIndexPath:indexPath];
frpCollectionViewCell.layer.borderWidth=0.25f;
frpCollectionViewCell.layer.borderColor=[UIColor lightGrayColor].CGColor;
UIButton *setFrpPriceButton = [UIButton new];
setFrpPriceButton.backgroundColor = UIColorFromRGB(0x2196f3);
[setFrpPriceButton setTitle:@"SET PRICE" forState:UIControlStateNormal];
[setFrpPriceButton addTarget:self action:@selector(setFrpPriceClick) forControlEvents:UIControlEventTouchUpInside];
setFrpPriceButton.tag = selectedCellIndex;
[frpCollectionViewCell addSubview:setFrpPriceButton];
setFrpPriceButton.titleLabel.font = [UIFont boldSystemFontOfSize:10];
setFrpPriceButton.clipsToBounds = YES;
[setFrpPriceButton mas_makeConstraints:^(MASConstraintMaker *make)
{
make.top.equalTo(frpButtonLabel);
make.width.equalTo(frpCollectionViewCell).dividedBy(3);
make.right.equalTo(frpCollectionViewCell);
make.height.equalTo(frpTitleLabel);
}];
return frpCollectionViewCell;
}
- (NSInteger)numberOfSectionsInCollectionView: (UICollectionView *)displaySpecialityCollectionView
{
return 1;
}
- (CGSize)collectionView:(UICollectionView *)displaySpecialityCollectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
return CGSizeMake(self.view.frame.size.width, self.view.frame.size.height/2);
}
-(UIEdgeInsets)collectionView:(UICollectionView *)displaySpecialityCollectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
return UIEdgeInsetsMake(0,0,0,0);
}
- (void)collectionView:(UICollectionView *)displaySpecialityCollectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
selectedCellIndex = (int)[indexPath row];
}
您应该对您的单元进行子类化,而不是每次都重新创建它。但无论如何,请尝试:
[setFrpPriceButton addTarget:self action:@selector(setFrpPriceClick:) forControlEvents:UIControlEventTouchUpInside];
setFrpPriceButton.tag = indexPath.row;
您的方法应该如下所示:
-(void)setFrpPriceClick:(id)sender {
NSIndexPath *indexPath = [NSIndexPath indexPathForItem:[sender tag] inSection:0];
NSLog(@"row number is %@",indexPath.row);
}
只需更改 "cellForRowAtIndexPath" 方法中的这一行:-
改变
setFrpPriceButton.tag = selectedCellIndex;
至
setFrpPriceButton.tag = indexPath.row;
另外,在方法 "setFrpPriceClick" 中访问按钮的点击事件是这样的:-
-(void)setFrpPriceClick:(id)sender {
NSIndexPath *indexPath = [NSIndexPath indexPathForItem:[sender tag] inSection:0];
NSLog(@"row number is %@",indexPath.row);
}
这是我为 UICollectionView
编写的代码。在此 UICollectionView
中,我使用 UIButton
并且我想知道单击按钮的单元格的索引。在点击按钮时 indexPath.item/row
的值在变化,我没有得到正确的值。
- (void)viewDidLoad
{
[super viewDidLoad];
UICollectionViewFlowLayout *layout=[[UICollectionViewFlowLayout alloc] init];
frpCollectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height) collectionViewLayout:layout];
[frpCollectionView setDataSource:self];
[frpCollectionView setDelegate:self];
layout.minimumInteritemSpacing = 0;
layout.minimumLineSpacing = 0;
frpCollectionView.backgroundColor=[UIColor whiteColor];
[frpCollectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"cellIdentifier"];
[self.view addSubview:frpCollectionView];
[frpCollectionView mas_makeConstraints:^(MASConstraintMaker *make)
{
make.left.and.right.equalTo(self.view);
make.top.equalTo(self.view);
make.bottom.equalTo(self.view);
}];
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return frpTitleArray.count;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath;
{
frpCollectionViewCell = [frpCollectionView dequeueReusableCellWithReuseIdentifier:@"cellIdentifier" forIndexPath:indexPath];
frpCollectionViewCell.layer.borderWidth=0.25f;
frpCollectionViewCell.layer.borderColor=[UIColor lightGrayColor].CGColor;
UIButton *setFrpPriceButton = [UIButton new];
setFrpPriceButton.backgroundColor = UIColorFromRGB(0x2196f3);
[setFrpPriceButton setTitle:@"SET PRICE" forState:UIControlStateNormal];
[setFrpPriceButton addTarget:self action:@selector(setFrpPriceClick) forControlEvents:UIControlEventTouchUpInside];
setFrpPriceButton.tag = selectedCellIndex;
[frpCollectionViewCell addSubview:setFrpPriceButton];
setFrpPriceButton.titleLabel.font = [UIFont boldSystemFontOfSize:10];
setFrpPriceButton.clipsToBounds = YES;
[setFrpPriceButton mas_makeConstraints:^(MASConstraintMaker *make)
{
make.top.equalTo(frpButtonLabel);
make.width.equalTo(frpCollectionViewCell).dividedBy(3);
make.right.equalTo(frpCollectionViewCell);
make.height.equalTo(frpTitleLabel);
}];
return frpCollectionViewCell;
}
- (NSInteger)numberOfSectionsInCollectionView: (UICollectionView *)displaySpecialityCollectionView
{
return 1;
}
- (CGSize)collectionView:(UICollectionView *)displaySpecialityCollectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
return CGSizeMake(self.view.frame.size.width, self.view.frame.size.height/2);
}
-(UIEdgeInsets)collectionView:(UICollectionView *)displaySpecialityCollectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
return UIEdgeInsetsMake(0,0,0,0);
}
- (void)collectionView:(UICollectionView *)displaySpecialityCollectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
selectedCellIndex = (int)[indexPath row];
}
您应该对您的单元进行子类化,而不是每次都重新创建它。但无论如何,请尝试:
[setFrpPriceButton addTarget:self action:@selector(setFrpPriceClick:) forControlEvents:UIControlEventTouchUpInside];
setFrpPriceButton.tag = indexPath.row;
您的方法应该如下所示:
-(void)setFrpPriceClick:(id)sender {
NSIndexPath *indexPath = [NSIndexPath indexPathForItem:[sender tag] inSection:0];
NSLog(@"row number is %@",indexPath.row);
}
只需更改 "cellForRowAtIndexPath" 方法中的这一行:-
改变
setFrpPriceButton.tag = selectedCellIndex;
至
setFrpPriceButton.tag = indexPath.row;
另外,在方法 "setFrpPriceClick" 中访问按钮的点击事件是这样的:-
-(void)setFrpPriceClick:(id)sender {
NSIndexPath *indexPath = [NSIndexPath indexPathForItem:[sender tag] inSection:0];
NSLog(@"row number is %@",indexPath.row);
}