iOS开发的一些奇巧淫技包括一款GIF框架

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TableView不显示没内容的Cell怎么办?

类似这种,我不想让下面那些空的显示.

很简单.

  self.tableView.tableFooterView = [[UIView alloc] init]; 
 

试过的都说好.

加完这句之后就变成了这样.

自定义了leftBarbuttonItem左滑返回手势失效了怎么办?

       self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] 
                                           initWithImage:img 
                                           style:UIBarButtonItemStylePlain 
                                           target:self 
                                           action:@selector(onBack:)]; 
 self.navigationController.interactivePopGestureRecognizer.delegate = (id<uigesturerecognizerdelegate>)self;</uigesturerecognizerdelegate> 
 

ScrollView莫名其妙不能在viewController划到顶怎么办?

  self.automaticallyAdjustsScrollViewInsets = NO; 
 

键盘事件写的好烦躁,都想摔键盘了,怎么办?

1.买个结实的键盘.

2.使用IQKeyboardManager(github上可搜索),用完之后腰也不疼了,腿也不酸了.

为什么我的app老是不流畅,到底哪里出了问题?

如图

这个神器叫做:KMCGeigerCounter,快去github搬运吧.

怎么在不新建一个Cell的情况下调整separaLine的位置?

  _myTableView.separatorInset = UIEdgeInsetsMake(0, 100, 0, 0); 
 

怎么点击self.view就让键盘收起,需要添加一个tapGestures么?

  - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
 { 
     [self.view endEditing:YES]; 
 } 
 

怎么给每个ViewController设定默认的背景图片?

使用基类啊,少年。

想在代码里改在xib里添加的layoutAttributes,但是怎么用代码找啊?

像拉button一样的拉你的约束.nslayoutattribute也是可以拉线的.

怎么像safari一样滑动的时候隐藏navigationbar?

  navigationController.hidesBarsOnSwipe = Yes 
 

导航条返回键带的title太讨厌了,怎么让它消失!

  [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60) 
                                                       forBarMetrics:UIBarMetricsDefault]; 
 

CoreData用起来好烦,语法又臭又长,怎么办?

MagicRecord

CollectionView 怎么实现tableview那种悬停的header?

CSStickyHeaderFlowLayou

能不能只用一个pan手势来代替UISwipegesture的各个方向?

  - (void)pan:(UIPanGestureRecognizer *)sender 
 { 
 typedef NS_ENUM(NSUInteger, UIPanGestureRecognizerDirection) { 
      UIPanGestureRecognizerDirectionUndefined, 
      UIPanGestureRecognizerDirectionUp, 
      UIPanGestureRecognizerDirectionDown, 
      UIPanGestureRecognizerDirectionLeft, 
      UIPanGestureRecognizerDirectionRight 
 }; 
 static UIPanGestureRecognizerDirection direction = UIPanGestureRecognizerDirectionUndefined; 
 switch  (sender.state) { 
      case  UIGestureRecognizerStateBegan: { 
          if  (direction == UIPanGestureRecognizerDirectionUndefined) { 
              CGPoint velocity = [sender velocityInView:recognizer.view]; 
              BOOL isVerticalGesture = fabs(velocity.y) > fabs(velocity.x); 
              if  (isVerticalGesture) { 
                  if  (velocity.y > 0) { 
                      direction = UIPanGestureRecognizerDirectionDown; 
                  }  else  { 
                      direction = UIPanGestureRecognizerDirectionUp; 
                  } 
              } 
              else  { 
                  if  (velocity.x > 0) { 
                      direction = UIPanGestureRecognizerDirectionRight; 
                  }  else  { 
                      direction = UIPanGestureRecognizerDirectionLeft; 
                  } 
              } 
          } 
          break ; 
      } 
      case  UIGestureRecognizerStateChanged: { 
          switch  (direction) { 
              case  UIPanGestureRecognizerDirectionUp: { 
                  [self handleUpwardsGesture:sender]; 
                  break ; 
              } 
              case  UIPanGestureRecognizerDirectionDown: { 
                  [self handleDownwardsGesture:sender]; 
                  break ; 
              } 
              case  UIPanGestureRecognizerDirectionLeft: { 
                  [self handleLeftGesture:sender]; 
                  break ; 
              } 
              case  UIPanGestureRecognizerDirectionRight: { 
                  [self handleRightGesture:sender]; 
                  break ; 
              } 
              default : { 
                  break ; 
              } 
          } 
          break ; 
      } 
      case  UIGestureRecognizerStateEnded: { 
          direction = UIPanGestureRecognizerDirectionUndefined;    
          break ; 
      } 
      default : 
          break ; 
 } 
 } 
 

拉伸图片的时候怎么才能让图片不变形？
1.UIImage *image = [[UIImage imageNamed:@"xxx"] stretchableImageWithLeftCapWidth:10 topCapHeight:10];

怎么播放GIF的时候这么卡，有没有好点的库？

FlipBoard出品的太适合你了：https://github.com/Flipboard/FLAnimatedImage

怎么一句话添加上拉刷新？

https://github.com/samvermette/SVPullToRefresh

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

怎么把tableview里cell的小对勾的颜色改成别的颜色？

  _mTableView.tintColor = [UIColor redColor]; 
 

本来我的statusbar是lightcontent的，结果用UIImagePickerController会导致我的statusbar的样式变成黑色，怎么办？

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

怎么把我的navigationbar弄成透明的而不是带模糊的效果？

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

怎么改变uitextfield placeholder的颜色和位置？

继承uitextfield，重写这个方法

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