改变文字输入框背景

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    
    UITextField *textField=[[UITextField alloc]initWithFrame:CGRectMake(50, 100, 200, 50)];
    textField.backgroundColor=[UIColor redColor];
    textField.delegate=self;
    [self.view addSubview:textField];
    
}
#pragma -mark -UITextFieldDelegate
-(BOOL) textFieldShouldBeginEditing:(UITextField *)textField{
    [textField setBackground:[UIImage imageNamed:@"1.jpg"]];
    return YES;
}

-(void) textFieldDidEndEditing:(UITextField *)textField{
    [textField setBackground:[UIImage imageNamed:@"2.jpg"]];
}
-(BOOL)textFieldShouldReturn: (UITextField *)TextField{
    [TextField resignFirstResponder];
    return YES;
}