能不能只用一個pan手勢來代替UISwipegesture的各個方向?

1 - (void)pan:(UIPanGestureRecognizer *)sender 2 { 3 4 typedef NS_ENUM(NSUInteger, UIPanGestureRecognizerDirection) { 5 UIPanGestureRecognizerDirectionUndefined, 6 UIPanGestureRecognizerDirectionUp, 7 UIPanGestureRecognizerDirectionDown, 8 UIPanGestureRecognizerDirectionLeft, 9 UIPanGestureRecognizerDirectionRight 10 }; 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 }

拉伸圖片的時候怎么才能讓圖片不變形？

1 UIImage *image = [[UIImage imageNamed:@"xxx"] stretchableImageWithLeftCapWidth:10 topCapHeight:10]; 2 (剛才有人提醒這個已經deprecated了哈,現在的方法叫resizableImageWithCapInsets).

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怎么播放GIF的時候這么卡，有沒有好點的庫？

FlipBoard出品的太適合你了。https://github.com/Flipboard/FLAnimatedImage

怎么一句話添加上拉刷新？

https://github.com/samvermette/SVPullToRefresh

1 [tableView addPullToRefreshWithActionHandler:^{ 2 // prepend data to dataSource, insert cells at top of table view 3 // call [tableView.pullToRefreshView stopAnimating] when done 4 } position:SVPullToRefreshPositionBottom];

怎么把tableview里cell的小對勾的顏色改成別的顏色？

_mTableView.tintColor = [UIColor redColor];

本來我的statusbar是lightcontent的，結果用UIImagePickerController會導致我的statusbar的樣式變成黑色，怎么辦？

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

怎么把我的navigationbar弄成透明的而不是帶模糊的效果？

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

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怎么改變uitextfield placeholder的顏色和位置？

繼承uitextfield，重寫這個方法

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

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你為什么知道這么多奇怪的花招？

去stackoverflow刷問題啊，少年！

轉載于:https://www.cnblogs.com/myios/p/4191228.html

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