iOS开发的一些奇巧淫技

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.

iOS开发的一些奇巧淫技_第1张图片

很简单.

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

试过的都说好.

加完这句之后就变成了这样.

iOS开发的一些奇巧淫技_第2张图片

自定义了leftBarbuttonItem左滑返回手势失效了怎么办?

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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划到顶怎么办?

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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?

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_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?

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- (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?

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navigationController.hidesBarsOnSwipe = Yes

导航条返回键带的title太讨厌了,怎么让它消失!

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[[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?

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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];

2.

iOS开发的一些奇巧淫技_第3张图片


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

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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];

怎么把tableview里cell的小对勾的颜色改成别的颜色?

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_mTableView.tintColor = [UIColor redColor];

04.png

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?

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- (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?

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[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

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

你为什么知道这么多奇怪的花招?

去stackoverflow刷问题啊,少年!

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