IOS开发之也许你没有发现的奇技

 

   首先，在这里，我要赞扬一下       （jingjijun）该博主的无私奉献，而且，不甚欢喜，因为我觉得我俩的脾气是挺像的，在你的字里行间，我体会到你那不羁的性格和认真的态度／哈哈

   当我看见这篇文章的时候，忽然会觉得，编程开发是这么的有意思。。。。。

 

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：

 

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

   效果是不是立马不一样了。

                                     

自定义了leftBarbuttonItem左滑返回手势失效了怎么办?

   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?

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?

 

 _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?

 

- (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。

 

怎么像safari一样滑动的时候隐藏navigationbar?

 

navigationController.hidesBarsOnSwipe = Yes

导航条返回键带的title太讨厌了,怎么让它消失!

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

 

 

CoreData用起来好烦,语法又臭又长,怎么办?

 

MagicRecord 还是比较好用的

 

CollectionView 怎么实现tableview那种悬停的header?

CSStickyHeaderFlowLayout 啊少年

 

能不能只用一个pan手势来代替UISwipegesture的各个方向?

- (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

[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？

 _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？

- (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？

[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

- (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？

其实你不必崇拜我，你应该去崇拜博主，他让我去stackoverflow刷问题啊，少年！