iOS开发的一些奇巧淫技

浏览数：26 / 时间：2015年06月11日

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.

技术分享

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.

技术分享

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

技术分享

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];

技术分享

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];

技术分享

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！

原文地址：http://www.cocoachina.com/ios/20141231/10783.html

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iOS开发的一些奇巧淫技