Question

更新：在删除细胞之前调整整数！

为什么滑动时会出现以下崩溃要删除？我的tableview行数取决于NSInteger;所以我不明白这里的问题是什么。通过调整此整数，我没有调整数据源吗？

#import "sendWithQuestionOptionsController.h"

 @interface sendWithQuestionOptionsController ()
@property NSInteger NUMBER_OPTIONS;
@end

@implementation sendWithQuestionOptionsController


-(void)viewWillAppear:(BOOL)animated {
self.NUMBER_OPTIONS=4;
SHOULD_SHOW_OPTIONS=YES;

//make the UISegmentedControl.

 }

#define MIMIMUM_NUMBER_OPTIONS 2 //be sure to change the UI in all the viewControllers to handle this as well if you end up changing anything.

 #define POST_HEIGHT 150

  #define OPTION_HEIGHT 50

  #define HEADER_SECTION_HEIGHT 20

 BOOL SHOULD_SHOW_OPTIONS;

 -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath    {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"postCell" forIndexPath:indexPath];
[cell.contentView setBackgroundColor:[UIColor redColor]];
return cell;
}

  - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 2;
}


   -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section  {
if (section==0) {
    return 1;
}
if (section==1 ) {
    if (SHOULD_SHOW_OPTIONS)    {
        return self.NUMBER_OPTIONS;
    } else{
        return 0;
    }
}
return 0;
}

  -(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section  {
if (section==0) {
    return 0;
}
return HEADER_SECTION_HEIGHT; //for the options header...
 }

 -(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.section==0) {
    return POST_HEIGHT;
}
return OPTION_HEIGHT;
}

  -(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section  {

if (section==0) {
        return @""; //no title for the first header (first header isn't shown)
    }
    if (section==1) {
        if (self.NUMBER_OPTIONS==2)  {
            return @"Options";
        } else{
            return @"Options (swipe to delete)"; //they can still swipe to delete more.
        }
    }
    return @"";
}

 //called when user selects segmented control.
 -(void)selectedOptionsInSegmentedControl    {
SHOULD_SHOW_OPTIONS=YES;
self.NUMBER_OPTIONS=4;
 }

 //called when user selects segmented control.
 -(void)selectedNoOptionsInSegmentedControl  {
SHOULD_SHOW_OPTIONS=NO;
 }

 -(BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath  {
if (indexPath.section==0)   {
    return NO;
}
if (indexPath.section==1)   {
    if (indexPath.row>MIMIMUM_NUMBER_OPTIONS-1)   {
        return YES;
    }
}
return NO;
 }

-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath   {
if (editingStyle == UITableViewCellEditingStyleDelete) {
    [self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationLeft];
    self.NUMBER_OPTIONS-=1;
    //[self.tableView reloadData];
}
 }


@end

Answer 1

解决方案是首先通过调用self.NUMBER_OPTIONS- = 1更新NSInteger“数据源”;然后删除该行。

Tableview删除崩溃

1 个答案: