在重新看以前的入门书时，发现很多API在ios8以后都弃用了。今天是涉及到搜索栏。
在官方文档中可以看到，UISearchDisplayController连同UISearchDisplayDelegate在ios8以后被弃用了，以后用UISearchController替代。
@interface ViewController : UIViewController < UITableViewDelegate , UITableViewDataSource , UISearchBarDelegate , UISearchResultsUpdating >
@property(nonatomic , retain ) NSArray *recipes; // 源数据
@property(nonatomic , retain ) NSMutableArray *searchList; // 用于保存搜索结果的数组
@property(nonatomic , retain ) IBOutlet UITableView *tableview;
@property(nonatomic , retain ) UISearchController *sC; // 本来叫searchController的，但与后面有个方法里的参数重名了 ，遂改成这个2B名字
@end
-(void) viewDidLoad{
……
sC = [ [ UISearchController alloc ] initWithSearchResultsController : nil ];
sC.searchResultsUpdater = self;
sC.dimsBackgroundDuringPresentation = NO; // 这两个属性也可改为YES
sC.hidesNavigationBarDuringPresentation = NO;
sC.searchBar.frame = CGRectMake ( sC.searchBar.frame.origin.x , sC.searchBar.frame.origin.y , sC.searchBar.frame.size.width , 44.0) ;
tableview.tableHeaderView = sC.searchBar; // 是用代码添加的搜索栏，在故事板中拖控件拉线拉不上……
}
-numberOfRowsInsection{
if ( sC.active ){ // 新版的不再是对tableview做判断，直接用active属性
return [ searchList count ] ;
}else {
return [ recipes count ] ;
}
}
-cellForRowAtIndexPath{
……
if ( sC.active ){
cell.textLabel.text = [ searchList objectAtIndex : indexPath.row ] ;
}else{
cell.textLabel.text = [ recipes objectAtIndex : indexPath.row ];
}
return cell;
}
-prepareForSegue{
if ( [ segue.identifier isEqualToString:@"showRecipeDetail" ] ){
RecipeViewController *destViewController = segue.destinationViewControlelr;
NSIndexPath *indexPath = [ tableview indexPathForSelectedRow ] ;
if( sC.active ){
destViewController.recipeName = [ searchList objectAtIndex:indexPath.row ] ; // 不然选择的结果会出错
}else{
destViewController.recipeName = [ recipes objectAtIndex:indexPath.row ] ;
}
]
}
-updateSearchResultsForSearchController{
NSString *searchString = [ searchController.searchBar text ] ;
NSPredicate *predicate = [ NSPredicate predicateWithFormat:@"SELF CONTAINS [cd] %@",searchString ] ;
if( searchList != nil ){
[ searchList removeAllObjects ] ;
}
searchList = [ NSMutableArray arrayWithArray: [ recipes filteredArrayUsingPredicate:predicate ] ] ;
[ tableview reloadData ] ;
}
拖控件的暂时没搞清楚怎么写
