In the development process, UISearchBar is a rare control. In general, we use the system native style:

But what UI designers might want is this:



Maybe you think it's very simple: setting background color, border icon or something;
First look at setting the background color:

_It doesn't work if we set the backgroundcolor directly: because this directly sets the last layer view and the front layer gray view is UISearchBarBackground;
So using native backgroundColor does not work.

_You may find it very simple: Set the background of UISearchBarBackground directly, but let's look at the controls



_He's an ImageView, and it doesn't work to set the background color directly. Apple only exposes a setImage interface to the UISearchBarBackground. So you can use the transformation of Image and Color to set it up.

- (void)setBackgroundColor:(UIColor *)backgroundColor
{
    self.backgroundImage = [self createImageWithColor:backgroundColor];
}

- (void)setContentInset:(UIEdgeInsets)contentInset
{
   _contentEdgeInsets = contentInset;
   [self setNeedsDisplay];
}

- (UIImage *)createImageWithColor:(UIColor *)color
{
    CGRect rect=CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return theImage;
}

How to set UITextfield property:
For this TextField, UISearchBar is not used externally, but through view hierarchy:

_We can get UITextField through the following ways: so that we can set the input font style, alignment, cursor properties and so on.

(1) Get by KVC key value;

    self.searchTextField = [self valueForKey:@"_searchField"];

(2) Get the sub-view through the view;

if (_searchTextField == nil) {
        for(UIView* view in self.subviews)
        {
            for(id subview in view.subviews) {
                if([subview isKindOfClass:[UITextField class]])
                {
                    _searchTextField = subview;
                    return subview;
                }
            }
        }
    }

_For the left view of the picture we can set, but the size? What if you want such a thing?

This requires us to rewrite the control. The control I rewrite includes the following interfaces and properties:

@interface SHSearchBar : UISearchBar


// Search input box for UITextField operation
// Modify font size, edit agent, etc.
@property (nonatomic, strong) UITextField *searchTextField;

// Set the background color of the search box;
@property (nonatomic, strong) UIColor *backgroundColor;

/* Set the left search View;
 * Customize the search icon view.
 * It could be Button imageView and so on. Search icon frame s, styles, backgrounds, and so on can be set through this View.
 * Setting priority is higher than leftSearchIcon;
 */
@property (nonatomic, strong) UIView *leftSearchView;

// Set the icon of the left search button to modify only the picture.
@property (nonatomic, strong) UIImage *searchIcon;

// Set the icon of the clear button on the right to modify only the picture.
@property (nonatomic, strong) UIImage *clearIcon;

/* Setting EdgeInsets in the middle editing area,
 * Default frame.origin == (8.0, 6.0); not equal to bounds of searchBar
 * Textfild margins can be modified by setting Inset
 */
@property (nonatomic, assign) UIEdgeInsets contentEdgeInsets;

// Initialization control
- (instancetype)initWithFrame:(CGRect)frame;

// Set the offset of the left search button
- (void)setLeftSearchIconOffset:(UIOffset)offset;

// Set the Reect of the left search button to customize the layout
- (void)setLeftSearchIconRect:(CGRect)rect;

// Set the offset of the right clear button
- (void)setrithClearIconOffset:(UIOffset)offset;

- (void)setTintColor:(UIColor *)tintColor;

@end

If you like, please download it.



My GitHub code address: https://github.com/lvshaohua/SHSearchBar.git