//此处调用的是第三方封装的SearchBar，也可以自定义。    self.searchBarWithDelegate = [[INSSearchBar alloc] initWithFrame:CGRectMake(0, 5, 44.0, 44.0)];self.searchBarWithDelegate.delegate = self;UIView *searchView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 768, 44)];searchView.backgroundColor = [UIColor clearColor];[searchView addSubview:self.searchBarWithDelegate];UILabel *descriptionLabel2 = [[UILabel alloc] initWithFrame:CGRectMake(45.0, 0, 80, 44)];descriptionLabel2.textColor = [UIColor whiteColor];descriptionLabel2.font = [UIFont fontWithName:@"AvenirNext-Regular" size:18.0];descriptionLabel2.text = @"找点东西";[searchView addSubview:descriptionLabel2];self.navigationItem.titleView = searchView;

- (id)initWithFrame:(CGRect)frame
{self = [super initWithFrame:frame];if (self){// 初始化时加载collectionCell.xib文件NSArray *arrayOfViews = [[NSBundle mainBundle] loadNibNamed:@"ClassesViewCell" owner:self options:nil];// 如果路径不存在，return nilif (arrayOfViews.count < 1){return nil;}// 如果xib中view不属于UICollectionViewCell类，return nilif (![[arrayOfViews objectAtIndex:0] isKindOfClass:[UICollectionViewCell class]]){return nil;}// 加载nib
        self = [arrayOfViews objectAtIndex:0];CGFloat borderWidth = 2.0f;self.layer.borderWidth=borderWidth;self.layer.borderColor=[UIColor colorWithWhite:0.5f alpha:1.0f].CGColor;}return self;
}

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{UIView *sectionheader=[[UIView alloc]initWithFrame:CGRectMake(0, 0,CGRectGetWidth(self.view.bounds), 20)];return sectionheader;}

    self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;    //另外修改样式tableview样式为grouped

-(void)layoutSubviews
{[super layoutSubviews];self.imgview.bounds=CGRectMake(10,10,30,30);self.imgview.frame=CGRectMake(10,10,30,30);self.imgview.contentMode = UIViewContentModeScaleAspectFill;
}

CGRectGetWidth(self.view.bounds)

    [self.navigationController.navigationBar setBarTintColor:[UIColor brownColor]];

    [self.tabBar setTintColor:[UIColor whiteColor]];//设置提示色[self.tabBar setBarTintColor:[UIColor brownColor]];//设置背景色 有个bar!