How to Eliminate the Margin on the Left Side of a Uitableview, Without Creating a Gap on the Right

How do I eliminate the margin on the left side of a UITableView, without creating a gap on the right?

It appears the only solution I can find is to subclass UITableViewCell, and then override the layout of the imageView and textLabel. While researching this approach I found this related answer. (I guess I didn't realize this whole time I was searching for tableview behavior that was originally in iOS 6.)

My subclass has this one and only overridden method:

- (void)layoutSubviews
{
    [super layoutSubviews];

    // Slide image to the left, eliminating gutter
    self.imageView.frame = CGRectMake(0, 0, self.imageView.frame.size.width, self.imageView.frame.size.height);

    // Slide text label to the left, and extend width by additional
    // space gained by eliminating the left-most gutter
    self.textLabel.frame = CGRectMake((self.imageView.frame.origin.x + self.imageView.frame.size.width + 15), 0, self.textLabel.frame.size.width + 15, self.textLabel.frame.size.height);
}

My resulting tableview now looks exactly the way I want:

How do I adjust the left margin for prototype cells in a UITableView?

You just need to set contentInset property of the table view. You can set value according to your need.

self.tableView.contentInset = UIEdgeInsetsMake(0, -15, 0, 0);

OUTPUT RESULT

how to reduce/remove the left/right hand margin in a grouped UITableView?

Sure; just adjust the frame of the UITableView so it's a little wider than its superview and a little to the left (in the negative X direction, in other words) of its left boundary.

How to eliminate the left and right margins of a grouped UITableView

This is how you can eliminate the left and right margins of a grouped UITableView. Just subclass UITableViewCell. Note that if you want the margin to be something other than 0 just change the setFrame method to suit your needs.

//In CustomGroupedCell.h
#import <UIKit/UIKit.h>

@interface CustomGroupedCell : UITableViewCell
@property (nonatomic, weak) UITableView *myTableView;
@end

//In CustomGroupedCell.m
#import "CustomGroupedCell.h"

@implementation CustomGroupedCell
@synthesize myTableView = _myTableView;

- (void)setFrame:(CGRect)frame 
{
    frame = CGRectMake(- [self cellsMargin] , frame.origin.y, self.myTableView.frame.size.width + 2 *[self cellsMargin], frame.size.height);
    self.contentView.frame = frame;
    [super setFrame:frame];
}

- (CGFloat)cellsMargin {

    // No margins for plain table views
    if (self.myTableView.style == UITableViewStylePlain) {
        return 0;
    }

    // iPhone always have 10 pixels margin
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
    {
        return 10;
    }

    CGFloat tableWidth = self.myTableView.frame.size.width;

    // Really small table
    if (tableWidth <= 20) {
        return tableWidth - 10;
    }

    // Average table size
    if (tableWidth < 400) {
        return 10;
    }

    // Big tables have complex margin's logic
    // Around 6% of table width,
    // 31 <= tableWidth * 0.06 <= 45

    CGFloat marginWidth  = tableWidth * 0.06;
    marginWidth = MAX(31, MIN(45, marginWidth));
    return marginWidth;
}

@end

How to adjust left and right insets or margins for UITableView tableHeaderView?

For UITableViews without section index:

label.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
    label.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
    label.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor)
])

For UITableViews with section index:

label.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
    label.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
    label.trailingAnchor.constraint(equalTo: tableView.layoutMarginsGuide.trailingAnchor)
])

iOS 9 UITableView separators insets (significant left margin)

Okay, I have found out the solution. The only thing required for that is to set on the presenting instance of UITableView that flag cellLayoutMarginsFollowReadableWidth

myTableView.cellLayoutMarginsFollowReadableWidth = NO;

I wanted to find some reference in the documentation but it looks like it is not ready yet, only mentioned on diff page.

As the flag was introduced in iOS 9 for the backward compatibility you should add a check before trying to set it:

if([myTableView respondsToSelector:@selector(setCellLayoutMarginsFollowReadableWidth:)])
{
    myTableView.cellLayoutMarginsFollowReadableWidth = NO;
}

For Swift 2.0 you can use #available to check iOS version.

if #available(iOS 9, *) {
    myTableView.cellLayoutMarginsFollowReadableWidth = false
}

Moreover you need to compile it with Xcode 7 or above.

EDIT

Please keep in mind that this is the only required fix if your separators looked "fine" up to iOS 8, otherwise you need to change a bit more. You can find info how to do this already on SO.

How to set left and right margin for UITableView in Swift

You can do this either by setting the .layoutMargins on the cell's contentView (either in the cell class itself or in cellForRowAt:

cell.contentView.layoutMargins = .init(top: 0.0, left: 23.5, bottom: 0.0, right: 23.5)

or on the table view itself:

override func viewDidLoad() {
    super.viewDidLoad()
    tableView.layoutMargins = .init(top: 0.0, left: 23.5, bottom: 0.0, right: 23.5)
    // if you want the separator lines to follow the content width
    tableView.separatorInset = tableView.layoutMargins
}

UITableViewCell in ios7 now has gaps on left and right

Adding the image to the cell.contentView fixes the problem:

[cell.contentView addSubview:imgView];

This way you don't even have to mind the separatorInset property.

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