UITableView的委托方法没有响应

Question

我对IOS开发很新，所以请原谅我，如果这个问题变得微不足道。以下是这种情况：

我希望能够调用didSelectRowAtIndexPath方法触发某些操作时，用户与表格视图单元格进行交互。但是，似乎这种方法从来没有因为某种原因而被调用。我相当肯定我的代码是有效的。我设置了delegate和dataSource属性，我符合UITableViewDelegate和UITableViewDataSource协议。

如果有人能够对此有所了解，我将非常感激。

我的代码：

#import <UIKit/UIKit.h> 
#import <MessageUI/MessageUI.h> 
@class Employee; 

#define kTelephoneRowIndex 0 
#define kEmailRowIndex  1 
#define kLeftLabelTag  4096 
#define kRightLabelTag  4097 


@interface PersonnelDetailsViewController : UIViewController <UITableViewDelegate, 
UITableViewDataSource, MFMailComposeViewControllerDelegate> { 
    UITableView *contactDetailsTable; 
Employee *employee; 
} 

@property (nonatomic, retain) UITableView *contactDetailsTable; 
@property (nonatomic, retain) Employee *employee; 

+ (NSString *)resourceFilePath:(NSString *)fileName ofType:(NSString *)type; 


@end 

和我.m文件

#import <QuartzCore/QuartzCore.h> 
#import "PersonnelDetailsViewController.h" 
#import "Employee.h" 


@implementation PersonnelDetailsViewController 

@synthesize contactDetailsTable, employee; 


+ (NSString *)resourceFilePath:(NSString *)fileName ofType:(NSString *)type { 
return [[NSBundle mainBundle] pathForResource:fileName ofType:type]; 
} 

- (void)loadView { 
[super loadView]; 

// Create the header view for the table view 
UIView *headerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 110)]; 

// Set the image, using rounded corners 
UIImage *employeeImage; 
if ([employee.image length] == 0) 
    employeeImage = [UIImage imageNamed:@"logoL1nda70by80"]; 
else 
    employeeImage = [UIImage imageNamed:employee.image]; 

UIImageView *employeeImageView = [[UIImageView alloc] initWithImage:employeeImage]; 
employeeImageView.frame = CGRectMake(10, 15, 70, 80); 
employeeImageView.layer.masksToBounds = YES; 
employeeImageView.layer.cornerRadius = 5.0; 
employeeImageView.layer.borderWidth = 1.0; 
employeeImageView.layer.borderColor = [[UIColor grayColor] CGColor]; 
[headerView addSubview:employeeImageView]; 

UILabel *nameView = [[UILabel alloc] initWithFrame:CGRectMake(95, 35, 180, 20)]; 
nameView.text = employee.name; 
nameView.font = [UIFont boldSystemFontOfSize:18]; 
[headerView addSubview:nameView]; 

UILabel *functionView = [[UILabel alloc] initWithFrame:CGRectMake(95, 55, 140, 16)]; 
functionView.text = employee.function; 
functionView.textColor = [UIColor grayColor]; 
functionView.font = [UIFont systemFontOfSize:14]; 
[headerView addSubview:functionView]; 

[employeeImage release]; 
[employeeImageView release]; 
[nameView release]; 
[functionView release]; 

contactDetailsTable = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 320, 370) style: UITableViewStyleGrouped]; 
contactDetailsTable.backgroundColor = [UIColor clearColor]; 
contactDetailsTable.tableHeaderView = headerView; 
[headerView release]; 
contactDetailsTable.delegate = self; 
contactDetailsTable.dataSource = self; 

[self.view addSubview:contactDetailsTable]; 
} 

- (void)viewDidUnload { 
self.contactDetailsTable = nil; 
self.employee = nil; 

[super viewDidUnload]; 
} 

- (void)viewWillAppear:(BOOL)animated { 
[contactDetailsTable reloadData]; 
} 

- (void)dealloc { 
[contactDetailsTable release]; 
[employee release]; 
[super dealloc]; 
} 

#pragma mark - 
#pragma mark Table View Data Source Methods 
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { 
return 2; 
} 

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { 
return 1;did 
} 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 
static NSString *contactDetailIdentifier = @"contactDetailIdentifier"; 

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:contactDetailIdentifier]; 

if (cell == nil) {  
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault 
            reuseIdentifier:contactDetailIdentifier] autorelease]; 
    UILabel *leftLabel = [[UITextField alloc] initWithFrame:CGRectMake(5, 12, 70, 25)]; 
    leftLabel.textAlignment = UITextAlignmentRight; 
    leftLabel.textColor = [UIColor grayColor]; 
    leftLabel.tag = kLeftLabelTag; 
    leftLabel.userInteractionEnabled = NO; 
    [cell.contentView addSubview:leftLabel]; 
    [leftLabel release]; 

    UILabel *rightLabel = [[UITextField alloc] initWithFrame:CGRectMake(90, 12, 160, 25)]; 
    rightLabel.font = [UIFont boldSystemFontOfSize:16]; 
    rightLabel.tag = kRightLabelTag; 
    rightLabel.userInteractionEnabled = NO; 
    [cell.contentView addSubview:rightLabel]; 
    [rightLabel release]; 
} 
NSUInteger row = [indexPath row]; 
UILabel *leftLabel = (UILabel *)[cell viewWithTag:kLeftLabelTag]; 
UILabel *rightLabel = (UILabel *)[cell viewWithTag:kRightLabelTag]; 

switch (row) { 
    case kTelephoneRowIndex: 
     leftLabel.text = @"telefoon"; 
     rightLabel.text = employee.phone; 
     break; 
    case kEmailRowIndex: 
     leftLabel.text = @"e-mail"; 
     rightLabel.text = employee.email; 
     break; 
    default: 
     break; 
} 

return cell; 
} 

#pragma mark - 
#pragma mark Table View Delegate Methods 
- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath { 
return nil; 
} 

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { 
NSUInteger row = indexPath.row; 

if (row == 1) { 
    MFMailComposeViewController *mailController = [[MFMailComposeViewController alloc] init]; 
    [mailController setToRecipients:[NSArray arrayWithObject:employee.email]]; 
    [mailController.navigationBar setTintColor:[UIColor blackColor]]; 

    [self presentModalViewController:mailController animated:YES]; 
    mailController.mailComposeDelegate = self; 
    [mailController release]; 
} 

NSLog(@"Row selected is: %d", row); 
} 

#pragma mark - 
#pragma mark MFMailCompose View Delegate Methods 
- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error { 
[self dismissModalViewControllerAnimated:YES]; 
} 


@end 

Answer 1

检查tableView:willSelectRowAtIndexPath:商务部：

返回一个NSIndexPath对象以外indexPath如果你想要anoth呃细胞被选中。如果您不想选择该行，则返回nil。

你正在返回nil，基本上说你不希望选中该行的表视图。因此不调用tableView:didSelectRowAtIndexPath:。

Answer 2

当我遇到这个问题时，我发现解决方案是使用willSelectRowAtIndexPath。在同一个项目的其他地方didSelectItemAtIndexPath被调用罚款。

#pragma mark - UITableViewDelegate 

- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath { 
    // for some reason this is getting called instead of didSelectItemAtIndexPath 
    [self viewDetails:indexPath.row]; 
    return indexPath; 
} 

- (void)tableView:(UITableView *)tableView didSelectItemAtIndexPath:(NSIndexPath *)indexPath 
{ 
// [self viewDetails:indexPath.row]; 
}