AP102 2016/5/9 delegate

#import "ViewController.h"

@interface ViewController ()<UITextFieldDelegate>
**@property (weak, nonatomic) IBOutlet UITextField *UItextField;**//step1

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    **self.UItextField.delegate = self;**//step2
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
//step3
**-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];//resignFirstResponder
    //第一回應人預設會升起鍵盤，提高回應優先權
    return YES;

    //UIResponderChain
    //hitTesting


}**
@end