iOS開發的一些奇巧淫技

轉載：http://www.cocoachina.com/ios/20141229/10783.html

TableView不顯示沒內容的Cell怎麼辦?

相似這種,我不想讓下面那些空的顯示.

很簡單.

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

試過的都說好.

加完這句以後就變成了這樣.

自定義了leftBarbuttonItem左滑返回手勢失效了怎麼辦?

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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劃到頂怎麼辦?

1	self.automaticallyAdjustsScrollViewInsets = NO;

鍵盤事件寫的好煩躁,都想摔鍵盤了,怎麼辦?

1.買個結實的鍵盤.

2.使用IQKeyboardManager(github上可搜索),用完以後腰也不疼了,腿也不酸了.

爲何個人app總是不流暢,到底哪裏出了問題?

如圖

這個神器叫作:KMCGeigerCounter,快去github搬運吧.

怎麼在不新建一個Cell的狀況下調整separaLine的位置?

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

怎麼點擊self.view就讓鍵盤收起,須要添加一個tapGestures麼?

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

怎麼給每一個ViewController設定默認的背景圖片?

使用基類啊,少年。

想在代碼裏改在xib裏添加的layoutAttributes,可是怎麼用代碼找啊?

像拉button同樣的拉你的約束.nslayoutattribute也是能夠拉線的.

怎麼像safari同樣滑動的時候隱藏navigationbar?

1	navigationController.hidesBarsOnSwipe = Yes

導航條返回鍵帶的title太討厭了,怎麼讓它消失!

1 2	[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)                                                       forBarMetrics:UIBarMetricsDefault];

CoreData用起來好煩,語法又臭又長,怎麼辦?

MagicRecord

CollectionView 怎麼實現tableview那種懸停的header?

CSStickyHeaderFlowLayou

能不能只用一個pan手勢來代替UISwipegesture的各個方向?

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- (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 ; } }

拉伸圖片的時候怎麼才能讓圖片不變形？
1.UIImage *image = [[UIImage imageNamed:@"xxx"] stretchableImageWithLeftCapWidth:10 topCapHeight:10];

2.

怎麼播放GIF的時候這麼卡，有沒有好點的庫？

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

怎麼一句話添加上拉刷新？

https://github.com/samvermette/SVPullToRefresh

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

怎麼把tableview裏cell的小對勾的顏色改爲別的顏色？

1	_mTableView.tintColor = [UIColor redColor];

原本個人statusbar是lightcontent的，結果用UIImagePickerController會致使個人statusbar的樣式變成黑色，怎麼辦？

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

怎麼把個人navigationbar弄成透明的而不是帶模糊的效果？

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

怎麼改變uitextfield placeholder的顏色和位置？

繼承uitextfield，重寫這個方法

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

你爲何知道這麼多奇怪的花招？

去stackoverflow刷問題啊，少年！