ios开发小技巧

标签：ios   探花花花   刘祺旭   技巧   

类似这种,我不想让下面那些空的显示.

很简单.

[objc] view plaincopy

1. self.tableView.tableFooterView = [[UIView alloc] init];  

自定义了leftBarbuttonItem左滑返回手势失效了怎么办?

[objc] view plaincopy

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;  

[objc] view plaincopy

1. self.automaticallyAdjustsScrollViewInsets = NO;  

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?

[objc] view plaincopy

1. _myTableView.separatorInset = UIEdgeInsetsMake(0, 100, 0, 0);  

[objc] view plaincopy

1. - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event  
2. {  
3.    [self.view endEditing:YES];  
4. }  

[objc] view plaincopy

1. self.navigationController.hidesBarsOnSwipe = YES;  

[objc] view plaincopy

1. [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)  
2.                                                      forBarMetrics:UIBarMetricsDefault];  

[objc] view plaincopy

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. }  

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

[objc] view plaincopy

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];  

[objc] view plaincopy

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？

[objc] view plaincopy

1. - (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated  
2. {  
3.     [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];  
4. }  

[objc] view plaincopy

1. [self.navigationBar setBackgroundImage:[UIImage new]  
2.                          forBarMetrics:UIBarMetricsDefault];  
3. self.navigationBar.shadowImage = [UIImage new];  
4. self.navigationBar.translucent = YES;  

[objc] view plaincopy

1. - (void) drawPlaceholderInRect:(CGRect)rect {  
2.     [[UIColor blueColor] setFill];  
3.     [self.placeholder drawInRect:rect withFont:self.font lineBreakMode:UILineBreakModeTailTruncation alignment:self.textAlignment];  
4. }  

ios开发小技巧

标签：ios   探花花花   刘祺旭   技巧   

原文地址：http://blog.csdn.net/q644419002/article/details/47167275