根据输入的textField首字符排序

textfield的值发生改变时.调用方法筛选

    [[NSNotificationCenter

defaultCenter]

addObserver:self

selector:@selector(search:)

name:UITextFieldTextDidChangeNotification

object:nil];

}

-(void)search:(NSNotification*)notification{

   
NSString*str = [NSString

stringWithFormat:@"SELF like [c] '*%@*'",_tf.text];

   

   
NSPredicate*predicate = [NSPredicate

predicateWithFormat:str];

   

   
_dataAarray
= [_dataArray1

filteredArrayUsingPredicate:predicate];

   

    [_collection

reloadData];

//label内容自适应

 _label.contentMode
=UIViewContentModeScaleAspectFit

获得导航栏上按钮的视图
    UIView*v
= self.navigationItem.rightBarButtonItem.customView;