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iOS开发的一些小得技巧
2018-09-18 10:26 评论:0 阅读:855 诸葛亮倒骑小毛驴
ios iOS开发的一些小得技巧

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?

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

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?

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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?

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?

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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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