Perform animations on custom UITableViewCell - ios

Question

I'm trying to animate a few items in a custom UITableViewCell when a user presses a button in the cell. I have set addTarget: and added a method to animate the items in the cell. I've set a tag for the button so I can get the index. In the method, I call cellForRowAtIndexPath: to get the cell the button was called on. I'm casting the object returned by cellForRowAtIndexPath: to my custom cell. After I have the custom cell, I perform the animations on the objects. The problem is the animations aren't happening. When I try setting a property on one of the items in the cell, it doesn't work either. The custom cell is not returning nil so I'm not sure of the issue. What am I doing wrong?
Here is the code I'm using to call the animations
-(void)favButtonPressed:(id)sender{
FavoritesCell *favCell = (FavoritesCell *)[self tableView:self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:[sender tag] inSection:0]];
[UIView animateWithDuration:0.2 animations:^{
favCell.picButton.alpha = 0.5;
} completion:nil];
}

Answer 1

One way u can do it by using custom delegate like below, hope this helps u .
i took an example of your case go through this hope this helps u
in custom cell calss define delegate protocol like below
in FavoritesCell.h
#import <UIKit/UIKit.h>
#class FavoritesCell;
#protocol CellActionDelegate <NSObject>
- (void)doAnimationForCell:(FavoritesCell *)cell forButton:(UIButton *)picButton; //in this u can pass the cell itself
#end
#interface FavoritesCell : UITableViewCell
#property (nonatomic,retain)UIButton *picButton; //i am doing a simple test, say this is your pic button
#property (nonatomic,assign) id<CellActionDelegate>cellDelegate;
#end
and in FavoritesCell.m file
#import "FavoritesCell.h"
#implementation FavoritesCell
#synthesize cellDelegate;
#synthesize picButton = _picButton;
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
// Initialization code
_picButton = [[UIButton alloc]initWithFrame:CGRectMake(20, 3, 100, 100)];
//set the property // for test
[_picButton addTarget:self action:#selector(favButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
[_picButton.layer setCornerRadius:50];
[_picButton.layer setMasksToBounds:YES];
[_picButton.layer setBorderColor:[[UIColor blackColor]CGColor]];
[_picButton.layer setBorderWidth:5];
_picButton.backgroundColor = [UIColor greenColor];
[self.contentView addSubview:_picButton];
}
return self;
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
- (void)favButtonPressed:(UIButton *)sender
{
//or you can do the animation hear only no need to delegate to controller form cell
if([self.cellDelegate respondsToSelector:#selector(doAnimationForCell:forButton:)])
{
[self.cellDelegate doAnimationForCell:self forButton:sender]; //call this method
}
}
#end
in ViewController.h file
#import <UIKit/UIKit.h>
#import "FavoritesCell.h" //import it
#interface ViewController : UIViewController<UITableViewDataSource,UITableViewDelegate,CellActionDelegate> //confirms to delegate
//.... other stuffs
in ViewController.m file
//...other stuffs
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 5;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
FavoritesCell *cell = [tableView dequeueReusableCellWithIdentifier:#"CELL"];
if(cell == nil)
{
cell = [[FavoritesCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"CELL"];
}
cell.cellDelegate = self; //set the deleagte to this class
[cell.picButton setImage:[UIImage imageNamed:#"Two-Red-Flower-.jpg"] forState:UIControlStateNormal]; //set it hear or in custom cell itself
//...other logics
return cell;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 130.0f;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
}
//define the delegate method
- (void)doAnimationForCell:(FavoritesCell *)cell forButton:(UIButton *)picButton //this the picButton
{
//you can get index path of cell
//you can get the tapped button of the cell
//then do your animation
[UIView animateWithDuration:0.2 animations:^{
picButton.alpha = 0.5;
} completion:nil];
}

Answer 2

I think you want something like this:
-(void)favButtonPressed:(id)sender
{
CGPoint buttonPosition = [sender convertPoint:CGPointZero toView:self.myTableView];
// or try this one alternatively if the above line give wrong indexPath
//CGPoint buttonPosition = [sender convertPoint:((UIButton *)sender).center toView:self.myTableView];
NSIndexPath *indexPath = [self.myTableView indexPathForRowAtPoint:buttonPosition];
// I assume "self" here is your view controller
FavoritesCell *favCell = (FavoritesCell *)[self.myTableView cellForRowAtIndexPath:indexPath];
[UIView animateWithDuration:0.2 animations:^{
favCell.picButton.alpha = 0.5;
} completion:nil];
}