UISearchBar display issue - ios

Question

The searchbar's right edge is wider than the left, I don't know why? This is not cool.Please help me with this.Thank you very much.
Here's my code:
#property (nonatomic, strong) UITableView *tableView;
#property (nonatomic, strong) UISearchBar *searchBar;
#property (nonatomic, strong) UISearchDisplayController *strongSearchDisplayController;
self.searchBar = [[UISearchBar alloc] initWithFrame:CGRectZero];
self.searchBar.backgroundColor = [UIColor clearColor];
self.searchBar.placeholder = #"搜索";
self.searchBar.delegate = self;
[self.searchBar sizeToFit];
self.tableView = [[UITableView alloc] initWithFrame:CGRectMake(0.0, 0.0, SCREENWIDTH, SCREENHEIGHT - NAVIGATIONBARHEIGHT - TABBARHEIGHT ) style:UITableViewStylePlain];
self.tableView.delegate = self;
self.tableView.dataSource = self;
[self.view addSubview:self.tableView];
self.tableView.tableHeaderView = self.searchBar;
self.strongSearchDisplayController = [[UISearchDisplayController alloc] initWithSearchBar:self.searchBar contentsController:self];
self.searchDisplayController.searchResultsDataSource = self;
self.searchDisplayController.searchResultsDelegate = self;
self.searchDisplayController.delegate = self;
self.searchDisplayController.searchResultsTableView.separatorStyle = UITableViewCellSeparatorStyleNone;

Answer 1

My advice would be to implement your search bars frame this way:
CGRectZero is the equivalent to (0,0,0,0)
Additionally it's best to add the search bar to a view. Like so:
- (void) viewDidLoad:(BOOL)animated {
UIView *searchbarView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, 44)]; //This adds a container that will hold the search bar.
self.searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, 44)];
self.searchBar.delegate = self;
[searchbarView addSubview:self.searchBar];
self.tableView.tableHeaderView = searchbarView; //Inserts UIView into the header of self.tableView
}

Answer 2

You can make following:
Add top offset to your table that is equal to searchBar height:
self.tableView.contentInset = UIEdgeInsetsMake(searchController.searchBar.frame.height, 0, 0, 0);
Add your searchBar to the tableView directly, not to the tableHeaderView:
// remove this
self.tableView.tableHeaderView = self.searchBar;
// insert this
[self.tableView addSubview:self.searchBar];
Please be sure that searchBar rect has correct origin (0, 0)
Note: It will fix your problem, but searchBar's behaviour will be a bit different from original: search bar will be visible by default, there will be no auto-hide of search bar when it's half-closed, etc.