我有一张桌子，我检查/取消选中细胞..我不知道为什么，但有时我会得到以下异常：
'NSRangeException', reason: '*** -[__NSArrayI objectAtIndex:]: index 0 beyond bounds for empty array'
我试图重现那个错误，但它真的不是同时发生..我会把我的整个viewcontroller代码放在这里，也许你可以看到问题。我正在寻找好几天......
#import "EventMembersViewController.h"
#import "CostumContactCell.h"
#import "ChatViewController.h"
#import "ADVTheme.h"
#import "RCSwitchOnOff.h"
#import "ADVProgressBar.h"
#import "UtilitieHandler.h"
#import "ContactDTO.h"
#import "User.h"
#import "Event.h"
#import "DCConnector.h"
#import "LastEventsViewController.h"
#import <QuartzCore/QuartzCore.h>
#import <UIKit/UIKit.h>
#define UUID_USER_DEFAULTS_KEY @"UUID"
#define NAME_USER_DEFAULTS_KEY @"UserName"
#define UPNumber_USER_DEFAULTS_KEY @"UPNumber"
#define kCellImageViewTag 1000
@interface EventMembersViewController (){
NSMutableArray *totalContacts;
NSMutableArray *filteredContacts;
BOOL isFiltered;
UtilitieHandler *io;
UIImage *unselected, *selected;
NSMutableArray *selectedArray;
int counter;
User *appUser;
DCConnector *dccon;
}
@end
@implementation EventMembersViewController
@synthesize eventDTO, contactsTable;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
[ADVThemeManager customizeView:self.view];
[self initViewData];
}
- (void) initViewData{
self.searchBar.delegate = self;
self.contactsTable.delegate = self;
self.contactsTable.dataSource = self;
totalContacts = [[NSMutableArray alloc]init];
dccon = [DCConnector new];
totalContacts = [dccon getContacts];
// get appUser
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *phoneNumber;
if ([defaults objectForKey:UPNumber_USER_DEFAULTS_KEY] != nil) {
phoneNumber = [defaults objectForKey:UPNumber_USER_DEFAULTS_KEY];
appUser = [dccon getUserByPhonenumber:phoneNumber];
NSLog(@"displayName: %@", appUser.displayName);
}
// load images of checked/unchecked cells
selected = [UIImage imageNamed:@"checkmark.png"];
unselected = [UIImage imageNamed:@"uncheckmark.png"];
//populate selectedArray
[self populateSelectedArray];
// Set member counter
counter = 0;
UILabel *labelTitle = [[UILabel alloc] initWithFrame:CGRectZero];
labelTitle.backgroundColor = [UIColor clearColor];
labelTitle.textColor = [UIColor colorWithRed:0.98f green:0.96f blue:0.94f alpha:1.00f];
labelTitle.font = [UIFont fontWithName:@"OpenSans-Semibold" size:16];
labelTitle.text = @"Contacts 0/50";
[labelTitle sizeToFit];
UIView *viewTitle = [[UIView alloc] initWithFrame:labelTitle.bounds];
CGRect frameLbl = labelTitle.bounds;
viewTitle.frame = frameLbl;
[viewTitle addSubview:labelTitle];
[self.navigationItem setTitleView:viewTitle];
UIBarButtonItem *newEventToggleView = [[UIBarButtonItem alloc]initWithTitle:@"Create" style:UIBarButtonItemStylePlain target:self action:@selector(initNextEventsOverview)];
[newEventToggleView setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys: [UIFont fontWithName:@"OpenSans-Semibold" size:12.0], UITextAttributeFont,nil] forState:UIControlStateNormal];
[self.navigationItem setRightBarButtonItem:newEventToggleView];
self.contactsTable.backgroundColor = [UIColor clearColor];
self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"background-tbl"]];
}
- (void) initNextEventsOverview{
NSMutableArray *selectedContacts = [[NSMutableArray alloc]init];
if (counter == 0) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Please select at least one contact!"
message:@""
delegate:self
cancelButtonTitle:@"OK"
otherButtonTitles: nil];
[alert show];
}else{
NSLog(@"LENGTH %d", [selectedArray count]);
for (int i = 0; i < [selectedArray count]; i++) {
NSLog(@"Loop %d", i);
BOOL selected_b = [[selectedArray objectAtIndex:i] boolValue];
NSLog(@"Bool of Loop %d", selected_b);
if (selected_b) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
CostumContactCell *cell = [contactsTable cellForRowAtIndexPath:indexPath];
ContactDTO *member = [ContactDTO new];
member = cell.contactObject;
User *invitedUser = [dccon getUserByPhonenumber:member.phoneNumber];
[selectedContacts addObject:invitedUser];
}
}
self.eventDTO.invitedMembers = selectedContacts;
// Create Event and push to overview list
if ([dccon createEvent:self.eventDTO :appUser]) {
LastEventsViewController *recentEvent = [[LastEventsViewController alloc]init];
recentEvent.navigationItem.hidesBackButton = YES;
[[self navigationController]pushViewController:recentEvent animated:YES];
}
}
}
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText{
if (searchText.length == 0) {
isFiltered = NO;
}else{
isFiltered = YES;
filteredContacts = [[NSMutableArray alloc]init];
for (ContactDTO *str in totalContacts) {
NSRange stringRange = [str.fullName rangeOfString:searchText options:NSCaseInsensitiveSearch];
if (stringRange.location != NSNotFound) {
[filteredContacts addObject:str];
}
}
}
[self.contactsTable reloadData];
}
-(void)searchBarSearchButtonClicked:(UISearchBar *)searchBar{
[self.searchBar resignFirstResponder];
}
// table iew delegate methodes..
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
if (isFiltered) {
return [filteredContacts count];
}
return [totalContacts count];
}
- (void)populateSelectedArray
{
NSMutableArray *array = [[NSMutableArray alloc] initWithCapacity:[totalContacts count]];
for (int i=0; i < [totalContacts count]; i++)
[array addObject:[NSNumber numberWithBool:NO]];
selectedArray = array;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
[self.contactsTable deselectRowAtIndexPath:indexPath animated:NO];
BOOL selected_b = [[selectedArray objectAtIndex:[indexPath row]] boolValue];
if (!selected_b) {
if (counter < 51) {
[selectedArray replaceObjectAtIndex:[indexPath row] withObject:[NSNumber numberWithBool:YES]];
counter = counter + 1;
}else{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Maximal invites reached!"
message:@""
delegate:self
cancelButtonTitle:@"OK"
otherButtonTitles: nil];
[alert show];
}
}else{
[selectedArray replaceObjectAtIndex:[indexPath row] withObject:[NSNumber numberWithBool:NO]];
counter = counter - 1;
}
[self updateViewTitle:counter];
[self.contactsTable reloadData];
}
-(void)updateViewTitle:(int)count{
UILabel *labelTitle = [[UILabel alloc] initWithFrame:CGRectZero];
labelTitle.backgroundColor = [UIColor clearColor];
labelTitle.textColor = [UIColor colorWithRed:0.98f green:0.96f blue:0.94f alpha:1.00f];
labelTitle.font = [UIFont fontWithName:@"OpenSans-Semibold" size:16];
labelTitle.text = [NSString stringWithFormat:@"Contact %d/50", count];
[labelTitle sizeToFit];
UIView *viewTitle = [[UIView alloc] initWithFrame:labelTitle.bounds];
CGRect frameLbl = labelTitle.bounds;
viewTitle.frame = frameLbl;
[viewTitle addSubview:labelTitle];
[self.navigationItem setTitleView:viewTitle];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier = @"Cell";
CostumContactCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = (CostumContactCell *)[CostumContactCell cellFromNibNamed:@"CostumContactCell"];
cell.contactImage.layer.cornerRadius = 5;
cell.contactImage.layer.masksToBounds = YES;
UIImageView *av = [[UIImageView alloc] initWithFrame:CGRectMake(20, 20, 277, 58)];
av.backgroundColor = [UIColor clearColor];
av.opaque = NO;
av.image = [UIImage imageNamed:@"list-element.png"];
cell.backgroundView = av;
UIImageView *imageView = [[UIImageView alloc] initWithImage:unselected];
imageView.frame = CGRectMake(cell.frame.size.width - 40.0, 15.0 , 25.0, 25.0);
[cell.contentView addSubview:imageView];
imageView.tag = kCellImageViewTag;
}
UIImageView *imageView = (UIImageView *)[cell.contentView viewWithTag:kCellImageViewTag];
NSNumber *selectedNS = [selectedArray objectAtIndex:[indexPath row]];
imageView.image = ([selectedNS boolValue]) ? selected : unselected;
[UIView commitAnimations];
if (!isFiltered) {
ContactDTO *contact = [totalContacts objectAtIndex:indexPath.row];
cell.contactName.text = contact.fullName;
cell.contactStatus.text = contact.status;
cell.contactObject = contact;
} else {
ContactDTO *contact = [filteredContacts objectAtIndex:indexPath.row];
cell.contactName.text = contact.fullName;
cell.contactStatus.text = contact.status;
cell.contactObject = contact;
}
return cell;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
它在那个循环中崩溃：
- (void) initNextEventsOverview{
NSMutableArray *selectedContacts = [[NSMutableArray alloc]init];
if (counter == 0) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Please select at least one contact!"
message:@""
delegate:self
cancelButtonTitle:@"OK"
otherButtonTitles: nil];
[alert show];
}else{
NSLog(@"LENGTH %d", [selectedArray count]);
for (int i = 0; i < [selectedArray count]; i++) {
NSLog(@"Loop %d", i);
BOOL selected_b = [[selectedArray objectAtIndex:i] boolValue];
NSLog(@"Bool of Loop %d", selected_b);
if (selected_b) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
CostumContactCell *cell = [contactsTable cellForRowAtIndexPath:indexPath];
ContactDTO *member = [ContactDTO new];
member = cell.contactObject;
User *invitedUser = [dccon getUserByPhonenumber:member.phoneNumber];
[selectedContacts addObject:invitedUser];
}
}
self.eventDTO.invitedMembers = selectedContacts;
// Create Event and push to overview list
if ([dccon createEvent:self.eventDTO :appUser]) {
LastEventsViewController *recentEvent = [[LastEventsViewController alloc]init];
recentEvent.navigationItem.hidesBackButton = YES;
[[self navigationController]pushViewController:recentEvent animated:YES];
}
}
}
我很感激任何提示......
答案 0 :(得分：0)
错误表明导致异常的数组是 NOT 一个可变数组，而是一个常规的NSArray，它排除了所有可变数组，包括selectedArray。
我猜这个错误与这些行有关
if (selected_b) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
CostumContactCell *cell = [contactsTable cellForRowAtIndexPath:indexPath];
ContactDTO *member = [ContactDTO new];
member = cell.contactObject;
User *invitedUser = [dccon getUserByPhonenumber:member.phoneNumber];
[selectedContacts addObject:invitedUser];
}
特别是那一行：
User *invitedUser = [dccon getUserByPhonenumber:member.phoneNumber];
您可以添加一个异常断点，如图here所示，以帮助您更好地调试代码。