iOS开发的一些奇巧淫技
原文:http://www.cocoachina.com/ios/20141229/10783.html
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.
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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.
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.
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]; |
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！
