1-->TableView不顯示沒內(nèi)容的Cell怎么辦?
    很簡單
    self.tableView.tableFooterView = [[UIView alloc] init];
    試過的都說好.


2-->自定義了leftBarbuttonItem左滑返回手勢失效了怎么辦?

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



3-->ScrollView莫名其妙不能在viewController劃到頂怎么辦?
    self.automaticallyAdjustsScrollViewInsets = NO;


4-->鍵盤事件寫的好煩躁,都想摔鍵盤了,怎么辦?
   1.買個結(jié)實的鍵盤.
   2.使用IQKeyboardManager(github上可搜索),用完之后腰也不疼了,腿也不酸了.


5-->為什么我的app老是不流暢,到底哪里出了問題?
   這個神器叫做:KMCGeigerCounter,快去github搬運吧.


6-->怎么在不新建一個Cell的情況下調(diào)整（隱藏）separaLine的位置?
   _myTableView.separatorInset = UIEdgeInsetsMake(0, screenWidth, 0, 0);
(注意: titleLabel的位置也會跟著改變)


7-->怎么點擊self.view就讓鍵盤收起,需要添加一個tapGestures么 ? NO
  - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
  {
   [self.view endEditing:YES];
  }


8-->怎么給每個ViewController設定默認的背景圖片?
   使用基類啊,少年。


9-->想在代碼里改在xib里添加的layoutAttributes,但是怎么用代碼找啊?
    像拉button一樣的拉你的約束.nslayoutattribute也是可以拉線的.


10-->怎么像safari一樣滑動的時候隱藏navigationbar?
    navigationController.hidesBarsOnSwipe = Yes


11-->導航條返回鍵帶的title太討厭了,怎么讓它消失!
     [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)
                                                     forBarMetrics:UIBarMetricsDefault];
                                                     

12-->CoreData用起來好煩,語法又臭又長,怎么辦?
     MagicRecord


13-->CollectionView 怎么實現(xiàn)tableview那種懸停的header?
     CSStickyHeaderFlowLayout


14-->能不能只用一個pan手勢來代替UISwipegesture的各個方向?
- (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;
}
}



15-->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.使用九切片技術(shù)


16-->怎么播放GIF的時候這么卡闺兢，有沒有好點的庫掌测？
     FlipBoard出品的太適合你了： 


17-->怎么一句話添加上拉刷新？
     使用MJRefresh 最新的已經(jīng)支持gif 圖和添加刷新圖片了

18-->怎么把tableview里cell的小對勾的顏色改成別的顏色亮靴？
    _mTableView.tintColor = [UIColor redColor];


19-->本來我的statusbar是lightcontent的睦焕，結(jié)果用UIImagePickerController會導致我的statusbar的樣式變成黑色，怎么辦额各？

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


20-->怎么把我的navigationbar弄成透明的而不是帶模糊的效果？

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


21-->怎么改變uitextfield placeholder的顏色和位置吧恃？
   繼承uitextfield虾啦，重寫這個方法

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


22-->如何修改導航返回按鈕的標題（默認是上一級導航的title） ？
    // 推到下個頁面之前 修改backItem標題為返回
    UIBarButtonItem *backBtn = [[UIBarButtonItem alloc] init];
    backBtn.title = @"返回";
    self.navigationItem.backBarButtonItem = backBtn;
    [self.navigationController pushViewController:zhtVC animated:YES];