【发布时间】：2012-06-23 04:33:46
【问题描述】：
第一关标签不起作用。我这样说是因为我为特定单元格创建了 4 个按钮，它们都具有相同的标签，即 indexPath.row = tag。
在我的 TableViewCellForRowAtIndexpath 中
- (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;
}
这里是我试图访问我在单元格中创建的单选按钮的地方。我想做的是这个
if([credits objectAtIndex:i]) == radioButtonA{
做事。我不说 == [radioButtonA 标签] 的原因是因为我还有其他三个按钮都具有相同的标签。如果您阅读了代码，您就会明白为什么以这种方式设置标签。 }
我要的是 1 帮助，2 是否有另一种方法来检查两个按钮，即对象是否相等，而不必依赖它们的标签。
不用担心 Try catch finally 我是用它来捕捉抛出的异常。
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];
}
}
更多信息这里是日志...
NSLog(@"%@",[credits objectAtIndex:i]);
NSLog(@"%@",radioButtonA);
THE First output is the log of the [credits object atIndex:i]
UIButton: 0x6c91430;帧 = (86 110; 32 30);不透明=否；层 = CALayer: 0x6c914f0
2012-06-20 20:24:01.568 TableView[12557:f803] UIButton: 0x6ea8ad0;帧 = (86 110; 32 30);不透明=否；标签 = 6;层=CALayer：0x6e746e0
如您所见，UIBUtton 不同，因此 == 运算符不起作用
【问题讨论】：
-
== 应该可以正常工作。你有错误吗？如果是这样，错误是什么？堆栈跟踪？
-
同意上面的评论，具体来说，
==应用于对象会测试地址是否相等，所以如果它是被不同变量引用的同一个对象，它将在那个地址。跨度> -
这里是日志... NSLog(@"%@",[credits objectAtIndex:i]); NSLog(@"%@",radioButtonA);第一个输出是 [credits object atIndex:i] 2012-06-20 20:22:14.219 TableView[12536:f803]
-
所以在每一行你有 4 个正确的按钮......例如，你有多少行（有这 4 个 btns）？
-
我有 8 行，每行有 4 个按钮以及标签等
标签： ios uitableview tags uibutton