UISearchBar 设置圆框方法

UIView*titleView = [[UIViewalloc]initWithFrame:CGRectMake(0,0,winWidth-87,30)];

_searchBar= [[UISearchBaralloc]initWithFrame:CGRectMake(0,0,winWidth-87,30)];

_searchBar.layer.cornerRadius=16;

_searchBar.layer.masksToBounds=YES;

//_searchBar.layer.borderWidth=1;

//_searchBar.layer.borderColor= [UIColoryellowColor].CGColor;

_searchBar.placeholder=@"关键字查询";

[titleViewaddSubview:_searchBar];

self.navigationItem.titleView= titleView;