能不能只用一个pan手势来代替UISwipegesture的各个方向?

 1 - (void)pan:(UIPanGestureRecognizer *)sender 2 { 3  4 typedef NS_ENUM(NSUInteger, UIPanGestureRecognizerDirection) { 5     UIPanGestureRecognizerDirectionUndefined, 6     UIPanGestureRecognizerDirectionUp, 7     UIPanGestureRecognizerDirectionDown, 8     UIPanGestureRecognizerDirectionLeft, 9     UIPanGestureRecognizerDirectionRight10 };11 12 static UIPanGestureRecognizerDirection direction = UIPanGestureRecognizerDirectionUndefined;13 14 switch (sender.state) {15 16     case UIGestureRecognizerStateBegan: {17 18         if (direction == UIPanGestureRecognizerDirectionUndefined) {19 20             CGPoint velocity = [sender velocityInView:recognizer.view];21 22             BOOL isVerticalGesture = fabs(velocity.y) > fabs(velocity.x);23 24             if (isVerticalGesture) {25                 if (velocity.y > 0) {26                     direction = UIPanGestureRecognizerDirectionDown;27                 } else {28                     direction = UIPanGestureRecognizerDirectionUp;29                 }30             }31 32             else {33                 if (velocity.x > 0) {34                     direction = UIPanGestureRecognizerDirectionRight;35                 } else {36                     direction = UIPanGestureRecognizerDirectionLeft;37                 }38             }39         }40 41         break;42     }43 44     case UIGestureRecognizerStateChanged: {45         switch (direction) {46             case UIPanGestureRecognizerDirectionUp: {47                 [self handleUpwardsGesture:sender];48                 break;49             }50             case UIPanGestureRecognizerDirectionDown: {51                 [self handleDownwardsGesture:sender];52                 break;53             }54             case UIPanGestureRecognizerDirectionLeft: {55                 [self handleLeftGesture:sender];56                 break;57             }58             case UIPanGestureRecognizerDirectionRight: {59                 [self handleRightGesture:sender];60                 break;61             }62             default: {63                 break;64             }65         }66         break;67     }68 69     case UIGestureRecognizerStateEnded: {70         direction = UIPanGestureRecognizerDirectionUndefined;   71         break;72     }73 74     default:75         break;76 }77 78 }

1 UIImage *image = [[UIImage imageNamed:@"xxx"] stretchableImageWithLeftCapWidth:10 topCapHeight:10];2 (刚才有人提醒这个已经deprecated了哈,现在的方法叫resizableImageWithCapInsets). 

1 [tableView addPullToRefreshWithActionHandler:^{2 // prepend data to dataSource, insert cells at top of table view3 // call [tableView.pullToRefreshView stopAnimating] when done4 } position:SVPullToRefreshPositionBottom];

1 - (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated { [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent]; }

1 [self.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault]; self.navigationBar.shadowImage = [UIImage new]; self.navigationBar.translucent = YES;

1 - (void) drawPlaceholderInRect:(CGRect)rect { [[UIColor blueColor] setFill]; [self.placeholder drawInRect:rect withFont:self.font lineBreakMode:UILineBreakModeTailTruncation alignment:self.textAlignment]; }