自定义searchbar,修改背景色

1、自定义searchBar:

（1）.h:

#import <UIKit/UIKit.h>

@interface EMSearchBar : UISearchBar

/**
 *  自定义控件自带的取消按钮的文字（默认为“取消”/“Cancel”）
 *
 *  @param title 自定义文字
 */
- (void)setCancelButtonTitle:(NSString *)title;

@end

(2).m：

#import "EMSearchBar.h"

@implementation EMSearchBar

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        for (UIView *subView in self.subviews) {
            if ([subView isKindOfClass:NSClassFromString(@"UISearchBarBackground")]) {
                [subView removeFromSuperview];
            }

            if ([subView isKindOfClass:NSClassFromString(@"UISearchBarTextField")]) {
                UITextField *textField = (UITextField *)subView;
                [textField setBorderStyle:UITextBorderStyleNone];
                textField.background = nil;
                textField.frame = CGRectMake(8, 8, self.bounds.size.width - 2* 8,
                                             self.bounds.size.height - 2* 8);
                textField.layer.cornerRadius = 6;

                textField.clipsToBounds = YES;
                textField.backgroundColor = [UIColor whiteColor];
            }
        }
    }
    return self;
}

/**
 *  自定义控件自带的取消按钮的文字（默认为“取消”/“Cancel”）
 *
 *  @param title 自定义文字
 */
- (void)setCancelButtonTitle:(NSString *)title
{
    for (UIView *searchbuttons in self.subviews)
    {
        if ([searchbuttons isKindOfClass:[UIButton class]])
        {
            UIButton *cancelButton = (UIButton*)searchbuttons;
            [cancelButton setTitle:title forState:UIControlStateNormal];
            break;
        }
    }
}

@end

2、修改背景色

- (UISearchBar *)searchBar
{
    if (!_searchBar) {
        _searchBar = [[EMSearchBar alloc] initWithFrame: CGRectMake(0, 0, self.view.frame.size.width, 44)];
        _searchBar.delegate = self;
        _searchBar.placeholder = NSLocalizedString(@"search", @"Search");
        //        _searchBar.backgroundColor = [UIColor colorWithRed:245/255.0 green:245/255.0 blue:245/255.0 alpha:1.000];
        _searchBar.backgroundImage = [self imageWithColor:[UIColor clearColor]];
    }

    return _searchBar;
}

- (UIImage *)imageWithColor:(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 *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return image;
}