Keyboard dismiss when scrollView drag.

ScrollView.m

@interface ScrollView <UIScrollViewDelegate,UITextFieldDelegate> {
    UITextField *_currentTF;
}

@implementation

- (void)viewDidLoad {
    yourScrollView.delegate = self;
    yourTextField.delegate = self;
}

#pragma mark UIScrollViewDelegate
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    [_currentTF resignFirstResponder];
}

#pragma mark UITextFieldDelegate
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    _currentTF = textField;
    return YES;
}