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.
很简单.
1 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?
1 self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] 2 initWithImage:img 3 style:UIBarButtonItemStylePlain 4 target:self 5 action:@selector(onBack:)]; 6 self.navigationController.interactivePopGestureRecognizer.delegate = (id)self;
ScrollView莫名其妙不能在viewController划到顶怎么办?
1 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?
1 _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?
1 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 2 { 3 [self.view endEditing:YES]; 4 }
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?
1 navigationController.hidesBarsOnSwipe = Yes
导航条返回键带的title太讨厌了,怎么让它消失!
1 [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60) 2 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?
1 - (void)pan:(UIPanGestureRecognizer *)sender 2 { 3 typedef NS_ENUM(NSUInteger, UIPanGestureRecognizerDirection) { 4 UIPanGestureRecognizerDirectionUndefined, 5 UIPanGestureRecognizerDirectionUp, 6 UIPanGestureRecognizerDirectionDown, 7 UIPanGestureRecognizerDirectionLeft, 8 UIPanGestureRecognizerDirectionRight 9 }; 10 static UIPanGestureRecognizerDirection direction = UIPanGestureRecognizerDirectionUndefined; 11 switch (sender.state) { 12 case UIGestureRecognizerStateBegan: { 13 if (direction == UIPanGestureRecognizerDirectionUndefined) { 14 CGPoint velocity = [sender velocityInView:recognizer.view]; 15 BOOL isVerticalGesture = fabs(velocity.y) > fabs(velocity.x); 16 if (isVerticalGesture) { 17 if (velocity.y > 0) { 18 direction = UIPanGestureRecognizerDirectionDown; 19 } else { 20 direction = UIPanGestureRecognizerDirectionUp; 21 } 22 } 23 else { 24 if (velocity.x > 0) { 25 direction = UIPanGestureRecognizerDirectionRight; 26 } else { 27 direction = UIPanGestureRecognizerDirectionLeft; 28 } 29 } 30 } 31 break; 32 } 33 case UIGestureRecognizerStateChanged: { 34 switch (direction) { 35 case UIPanGestureRecognizerDirectionUp: { 36 [self handleUpwardsGesture:sender]; 37 break; 38 } 39 case UIPanGestureRecognizerDirectionDown: { 40 [self handleDownwardsGesture:sender]; 41 break; 42 } 43 case UIPanGestureRecognizerDirectionLeft: { 44 [self handleLeftGesture:sender]; 45 break; 46 } 47 case UIPanGestureRecognizerDirectionRight: { 48 [self handleRightGesture:sender]; 49 break; 50 } 51 default: { 52 break; 53 } 54 } 55 break; 56 } 57 case UIGestureRecognizerStateEnded: { 58 direction = UIPanGestureRecognizerDirectionUndefined; 59 break; 60 } 61 default: 62 break; 63 } 64 }
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.
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
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的小对勾的颜色改成别的颜色？
1 _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？
1 - (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated 2 { 3 [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent]; 4 }
怎么把我的navigationbar弄成透明的而不是带模糊的效果？
1 [self.navigationBar setBackgroundImage:[UIImage new] 2 forBarMetrics:UIBarMetricsDefault]; 3 self.navigationBar.shadowImage = [UIImage new]; 4 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
1 - (void) drawPlaceholderInRect:(CGRect)rect { 2 [[UIColor blueColor] setFill]; 3 [self.placeholder drawInRect:rect withFont:self.font lineBreakMode:UILineBreakModeTailTruncation alignment:self.textAlignment]; 4 }
你为什么知道这么多奇怪的花招？
去stackoverflow刷问题啊，少年！
