Remove SeparatorInset on iOS 8 UITableView for Xco

问题:

I found a weird white space on UITableView for iPhone 6 Simulator (iOS 8) on Xcode 6 GM. I have tried to set the SeparatorInset from both storyboard and also the code, but the white space is till there.

The following code works on iOS 7 but not on iOS 8 (iPhone 6 simulator).

-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{
    if ([tableView respondsToSelector:@selector(setSeparatorInset:)]) {
        [tableView setSeparatorInset:UIEdgeInsetsZero];
    }
}

I attached screenshot below:

I am using AutoLayout by the way. I hope someone can show me a way to remove the weird white space on the TableView.

回答1:

Thanks Student for pointing me to the right direction with the comment "Try this self.myTableView.layoutMargins = UIEdgeInsetsZero;" This line of code will only work on iOS 8 because layoutMargins is only available from iOS 8. If I run the same code on iOS 7, it will crash.

@property(nonatomic) UIEdgeInsets layoutMargins
Description   The default spacing to use when laying out content in the view.
Availability  iOS (8.0 and later)
Declared In   UIView.h
Reference UIView Class Reference

Below is the right answer to solve this weird white space by setting the tableview layoutMargins and cell layoutMargins as UIEdgeInsetsZero if it exists (for iOS 8). And it will not crash on iOS 7 as well.

-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{

    if ([tableView respondsToSelector:@selector(setSeparatorInset:)]) {
        [tableView setSeparatorInset:UIEdgeInsetsZero];
    }

    if ([tableView respondsToSelector:@selector(setLayoutMargins:)]) {
        [tableView setLayoutMargins:UIEdgeInsetsZero];
    }

   if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {
        [cell setLayoutMargins:UIEdgeInsetsZero];
   }
}

See the screen shot below:-

回答2:

Try to create a UITableViewCell class category and add this getter

- (UIEdgeInsets)layoutMargins {
    return UIEdgeInsetsZero;
}

in iOS7 this will not be called cos there's no this property in SDK，and will not cause any crash； in iOS8 this will be called every time you use the cell

It works for me

回答3:

My solution with just three lines of code:

-(UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)row{
    //
    // ... your code ...
    //
    if ([cell respondsToSelector:@selector(preservesSuperviewLayoutMargins)]){
        cell.layoutMargins = UIEdgeInsetsZero;
        cell.preservesSuperviewLayoutMargins = false;
    }
    return cell;
}

回答4:

IOS8 introduce a new concept named Configuring Content Margins , a new property named layoutMargins is also introduced , for the details of the property , please refer to the Apple Doc . The type of layoutMargins is UIEdgeInsets , by default the value is {8,8,8,8} . To remove the seperator line of TableView in IOS8 , in addition to set tableView.seperatorInset = UIEdgeInsetsZero , you must also do as :

First define the macro

#define isIOS8SystemVersion (NSFoundationVersionNumber > NSFoundationVersionNumber_iOS_7_1)

In the UITableViewDelegate method add :

    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
    {
         static NSString *reuseId = @"cellReuseID" ;
         UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reuseId];
         if(!cell){
             cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:reuseId];     
         if(isIOS8SystemVersion){   
             cell.layoutMargins = UIEdgeInsetsZero;
             cell.preservesSuperviewLayoutMargins =NO ;
         }

    }

Doing these will remove the seperator line . You can also do as follow :

    UITableView *tableView = [[UITableView alloc] init];
    if(isIOS8SystemVersion){
         tableView.layoutMargins = UIEdgeInsetsZero ;
    }

and in the UITableViewDelegate method add :

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
     static NSString *reuseId = @"cellReuseID" ;
     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reuseId];
     if(!cell){
         cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:reuseId];     
     if(isIOS8SystemVersion){   
         cell.layoutMargins = UIEdgeInsetsZero;
     }
}

回答5:

In my case in Xcode 6.2, in addition to Will Q's answer, I have to go to Main.storyboard > select the UITableViewCell > Attributes Inspector. Change Separator dropdown list from Default Insets to Custom Insets. Change the left inset from 15 to 0.

回答6:

Workaround for iOS 7 & iOS 8

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{    
    cell.separatorInset = UIEdgeInsetsMake(0.0f, cell.frame.size.width, 0.0f, 0.0f); 
}

回答7:

In iOS8 you have to set the Inset both on Row and on Table level.

Row level in the cellForRowAtIndexPath:

if ([cell respondsToSelector:@selector(preservesSuperviewLayoutMargins)]){
    cell.layoutMargins = UIEdgeInsetsZero;
    cell.preservesSuperviewLayoutMargins = false;
}

Table level in the viewDidLoad:

[tableReference setSeparatorInset:UIEdgeInsetsZero];

After that it is a good idea to CLEAN your project. On some occasions I noted that these changes were not directly introduced in the executable App in the simulator.

回答8:

for iOS 8

try by setting cell.layoutMargins = UIEdgeInsetsZero; in cellForRowAtIndexPath method

回答9:

If you want to remove the white line, but keep separator inset as it is, just set the cell.backgroundColor to the tableView backgroundColor. Just setting the cell.contentView.backgroundColor does not make the problem disappear.

回答10:

I've tried many ways, none of them work but this one works for me.

回答11:

Add startup images for iPhone 6 and Plus. Before the images are added the phone is running in scaling mode, i.e. older Apps get scaled to fit the new screen sizes. This may be causing the lines. The new images are Retina HD 5.5 (iPhone6Plus) 1242x2208 and Retina HD 4.7 (iPhone6) 750x1334.

回答12:

See iOS 8 UITableView separator inset 0 not working

Basically, you need to set both the cell.layoutMargin as well as the tableView's layoutMargin. YMMV, but I had to set the table view up in layoutSubviews before it would work!

回答13:

To make your UITableView separator insets to zero for both iOS7 and iOS8, instead of making a change in the code, make a change in the xib for the UITableView by changing the View->Mode->Aspect Fill.

回答14:

I have static UITableView and wanted to shift the margin of a cell separator to the left edge.

Thanks to the above answers, this was my solution

override func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) {
    // needed to shift the margin a specific cell to the left edge
    if indexPath.section == 3 && indexPath.row == 0 {
        cell.layoutMargins = UIEdgeInsetsZero
        cell.preservesSuperviewLayoutMargins = false
        cell.separatorInset = UIEdgeInsetsMake(0.0, 0.0, 0.0, 0.0)
    }
}

回答15:

Just add the following:

tableView.separatorStyle = .none