您的位置：首页 > 移动开发 > IOS开发

iOS开发的一些奇巧淫技

2016-01-06 22:32 399 查看

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

2

3

4

5

6
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?

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

2

3

4
- (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?

1
navigationController.hidesBarsOnSwipe = Yes


导航条返回键带的title太讨厌了,怎么让它消失!

1

2
[[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?

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64
- (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];


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

2

3

4
[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？

1

2

3

4
- (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？

1

2

3

4
[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

1

2

3

4
- (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！
                                            

                                        

                        
                        内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 点击这里给我发消息 
                    

                    

                    

                        

                         标签： 
                                                

                        

                    


                

            


            

                
相关文章推荐

                

                
            

        

        

            

            
            

                

                    
新的分享

                    

                        
                    

                

            


            

                

                    
章节导航