新浪微博开发-（6）自定义搜索框

系统提供的搜索框太大 不符合我们项目开发的要求
所以我们应该定制 自定义搜索框以满足我们的需求
#import "QHDiscoverViewController.h"

@interface QHDiscoverViewController ()

@end

@implementation QHDiscoverViewController

- (void)viewDidLoad {
[super viewDidLoad];

QHLog(@"QHDiscoverViewController");

//系统提供的自定义搜索框
//UISearchBar *searchBar = [[UISearchBar alloc]init];
//ios5 之前可以用
//searchBar.backgroundImage = [UIImage imageNamed:@"searchbar_textfield_background"];

//    searchBar.scopeBarBackgroundImage = [UIImage imageNamed:@"searchbar_textfield_background"];
//    self.navigationItem.titleView = searchBar;
//

// Uncomment the following line to preserve selection between presentations.
// self.clearsSelectionOnViewWillAppear = NO;

// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
UITextField *searchBar = [[UITextField alloc]init];
searchBar.width = 350;
searchBar.height = 30;
searchBar.font = [UIFont systemFontOfSize:15];
searchBar.placeholder = @"请输入搜索条件";
searchBar.background = [UIImage imageNamed:@"searchbar_textfield_background"];

//设置左边的放大镜图标
UIImageView *searchIcon = [[UIImageView alloc]init];
searchIcon.image = [UIImage imageNamed:@"searchbar_textfield_search_icon"];
//如果没有设置宽高 不能显示 必须设置图片的宽高
searchIcon.width = 30;
searchIcon.height = 30;
searchIcon.contentMode = UIViewContentModeCenter;
//这两个属性是系统中提供的
searchBar.leftView = searchIcon;
searchBar.leftViewMode = UITextFieldViewModeAlways;
//[searchBar addSubview:searchIcon];

self.navigationItem.titleView = searchBar;

#warning 注意imageView 的一种用法

//通过initWithImage 来创建初始化UIImageView UIImageView 的尺寸默认就等于image的尺寸
//    UIImageView *image = [UIImage imageNamed:@"searchbar_textfield_search_icon"];
//    UIImageView *searchIcon = [[UIImageView alloc]initWithImage:image];

//通过init 来创建初始化绝大多数控件 控件都是没有尺寸的
//    UIImageView *searchIcon = [[UIImageView alloc]init];

}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
#warning Potentially incomplete method implementation.
// Return the number of sections.
return 0;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
#warning Incomplete method implementation.
// Return the number of rows in the section.
return 0;
}

/*
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:<#@"reuseIdentifier"#> forIndexPath:indexPath];

// Configure the cell...

return cell;
}
*/

/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the specified item to be editable.
return YES;
}
*/

/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
[tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
} else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
*/

/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
}
*/

/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/