How to check if two objects (UIButtons ) are the same - ios

Question

First off tags wont work. I say this because i create 4 buttons all with the same tag for a specific cell i.e indexPath.row = tag.
Inside My TableViewCellForRowAtIndexpath
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier = #"courseCell";
//Step 1: Check to se if we can reuse a cell from a row that has just rolled off the screen
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
//step 2: If there are no cell to reuse, create a new one
if (cell == nil){
cell = [[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
cell.selectionStyle = UITableViewCellSelectionStyleGray;
}
...
//-------------Creation of Custom Buttons-------------//
//-----img = "radioOn.png"-----//
//----img2 = "radioOff.png"----//
//----RadioButtonA----//
...
radioButtonA = [UIButton buttonWithType:UIButtonTypeCustom];
[radioButtonA addTarget:self action:#selector(radioButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
radioButtonA.tag=indexPath.row;
//----End RadioButtonA----//
//----RadioButtonB----//
radioButtonB = [UIButton buttonWithType:UIButtonTypeCustom];
[radioButtonB addTarget:self action:#selector(radioButtonClicked:)forControlEvents:UIControlEventTouchUpInside];
radioButtonB.tag =indexPath.row;
...
//----End RadioButtonB----//
//----RadioButtonC----//
radioButtonC = [UIButton buttonWithType:UIButtonTypeCustom];
[radioButtonC addTarget:self action:#selector(radioButtonClicked:)forControlEvents:UIControlEventTouchUpInside];
radioButtonC.tag = indexPath.row;
...
//----End RadioButtonC----//
//----RadioButtonNA----//
radioButtonNA = [UIButton buttonWithType:UIButtonTypeCustom];
radioButtonNA.tag = indexPath.row;
[radioButtonNA addTarget:self action:#selector(radioButtonClicked:)forControlEvents:UIControlEventTouchUpInside];
...
//----End RadioButtonC----//
//---------End of Radio Button Creations---------//
//---------UIStepper & StepperLabel Creation-----//
[cell.contentView addSubview:radioButtonA];
[cell.contentView addSubview:radioButtonB];
[cell.contentView addSubview:radioButtonC];
[cell.contentView addSubview:radioButtonNA];
//Step4: Return the cell
return cell;
}
#pragma mark - Buttons
- (void)radioButtonClicked:(UIButton *)sender
{
UIButton *myButton = sender;
// This Method and all the ones similar to this method is created to handle the UITouchUpInsideEvent that the user sends when pressing the radioButtons A-NA.
[radioButtons addObject:sender];
// Create an instance(object) of class NSIndexPath called indexPath and set its value the indexPath of the cell the user is currently in.
UITableViewCell *cell = (UITableViewCell *)[[sender superview] superview];
NSIndexPath *indexPath = [myTableView indexPathForCell:cell];
// Initialize two unique variables in order to check if the buttons being clicked are being referenced in the correct index.
int row = indexPath.row;
NSLog(#"Button is in row %d", row);
...
}
-(IBAction)button:(UIButton*)sender{
...
#try {
for (i=0; i<8; i++) {
if ([credits count ] ==0) {
break;
}
HERE is where i am trying to access the radiobuttons i created in my cell. What i would like to do is this
if([credits objectAtIndex:i]) == radioButtonA{
do stuff. The reason im not saying == [radioButtonA tag] is because i have three other buttons all with the same tag. If your read the code u see why the tags are set this way.
}
What I am asking for is 1 help, and 2 is there another way to check if two Buttons i.e objects are equal without having to rely on their tags.
Do not worry about the Try catch finally i was using it to catch the exception being thrown.
if ([[[[credits objectAtIndex:i]titleLabel]text] isEqualToString:#"A"]) {
NSLog(#"radioA is in array");
creditHours+=[[valueArray objectAtIndex:i]doubleValue];
gradeEarned+=(GradeA.doubleValue *[[valueArray objectAtIndex:i]doubleValue]);
NSLog(#"%f",gradeEarned);
continue;
}
if ([[[[credits objectAtIndex:i]titleLabel]text] isEqualToString:#"B"]) {
NSLog(#"radioB is in array");
creditHours+=[[valueArray objectAtIndex:i]doubleValue];
gradeEarned+=(GradeB.doubleValue *[[valueArray objectAtIndex:i]doubleValue]);
continue;
}
if ([[[[credits objectAtIndex:i]titleLabel]text] isEqualToString:#"C"]){
NSLog(#"radioC is in array");
creditHours+=[[valueArray objectAtIndex:i]doubleValue];
gradeEarned+=(GradeC.doubleValue *[[valueArray objectAtIndex:i]doubleValue]);
continue;
}
if([credits objectAtIndex:i]== radioButtonNA){
NSLog(#"boboboobbobob");
continue;
}
}
}
#catch (NSException *exception) {
NSLog(#"NSException Caught");
NSLog(#"Name: %#",exception.name);
NSLog(#"Reason: %#", exception.reason);
}
#finally {
NSLog(#"in finally block");
}
// if ([credits objectAtIndex: i] == defaulter) {
// UIAlertView *alert = [[UIAlertView alloc]initWithTitle:#"Failed to select all grades" message:[NSString stringWithFormat:#"Your grade selections have been reset"] delegate:self cancelButtonTitle:#"great"otherButtonTitles:nil];
// [alert show];
// [alert release];
// [self refreshArray];
// }
NSLog(#"%f",gradeEarned);
if (gradeEarned == 0) {
textLabel.text= [NSString stringWithFormat:#"%f",gradeEarned];
}else {
NSLog( #"boob");
sum= (gradeEarned)/(creditHours);
NSLog(#"%f",sum);
textLabel.text= [NSString stringWithFormat:#"%f",sum];
//[self refreshArray];
}
}
For more information Here is the log...
NSLog(#"%#",[credits objectAtIndex:i]);
NSLog(#"%#",radioButtonA);
THE First output is the log of the [credits object atIndex:i]
UIButton: 0x6c91430; frame = (86 110; 32 30); opaque = NO; layer = CALayer: 0x6c914f0
2012-06-20 20:24:01.568 TableView[12557:f803] UIButton: 0x6ea8ad0; frame = (86 110; 32 30); opaque = NO; tag = 6; layer = CALayer: 0x6e746e0
As you can see The UIBUttons are DIFFERENT thus == operator does not work

Answer 1

When checking two object against one another you cannot use ==, you have to use [objectA isEqual:objectB], if those two objects are the same the answer will be YES and NO if they are not.
To read more go to: https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Protocols/NSObject_Protocol/Reference/NSObject.html
and check what is written for isEqual:

Answer 2

I'm not sure, in the method,
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
you should add the buttons only when the cell is nil.just like this
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"courseCell";
//Step 1: Check to se if we can reuse a cell from a row that has just rolled off the screen
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
//step 2: If there are no cell to reuse, create a new one
if (cell == nil)
{
cell = [[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
cell.selectionStyle = UITableViewCellSelectionStyleGray;
//-------------Creation of Custom Buttons-------------//
//-----img = "radioOn.png"-----//
//----img2 = "radioOff.png"----//
//----RadioButtonA----//
...
radioButtonA = [UIButton buttonWithType:UIButtonTypeCustom];
[radioButtonA addTarget:self action:#selector(radioButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
radioButtonA.tag=indexPath.row;
//----End RadioButtonA----//
//----RadioButtonB----//
radioButtonB = [UIButton buttonWithType:UIButtonTypeCustom];
[radioButtonB addTarget:self action:#selector(radioButtonClicked:)forControlEvents:UIControlEventTouchUpInside];
radioButtonB.tag =indexPath.row;
...
//----End RadioButtonB----//
//----RadioButtonC----//
radioButtonC = [UIButton buttonWithType:UIButtonTypeCustom];
[radioButtonC addTarget:self action:#selector(radioButtonClicked:)forControlEvents:UIControlEventTouchUpInside];
radioButtonC.tag = indexPath.row;
...
//----End RadioButtonC----//
//----RadioButtonNA----//
radioButtonNA = [UIButton buttonWithType:UIButtonTypeCustom];
radioButtonNA.tag = indexPath.row;
[radioButtonNA addTarget:self action:#selector(radioButtonClicked:)forControlEvents:UIControlEventTouchUpInside];
...
//----End RadioButtonC----//
//---------End of Radio Button Creations---------//
//---------UIStepper & StepperLabel Creation-----//
[cell.contentView addSubview:radioButtonA];
[cell.contentView addSubview:radioButtonB];
[cell.contentView addSubview:radioButtonC];
[cell.contentView addSubview:radioButtonNA];
}
...
//Step4: Return the cell
return cell;
}

Answer 3

I had already known this, however, the purpose of this post was to see if their are any other ways. I also used the isMemberOfClass:[UIButton class] to further narrow down. Best way and most effective way of doing this is using the object's tags to compare against.