iOS開發奇淫技巧

WintonTalks發表於2016-01-05
iOS

TableView不顯示沒內容的Cell怎麼辦?

類似這種,我不想讓下面那些空的顯示.

01.png

很簡單.

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

試過的都說好.

加完這句之後就變成了這樣.

02.png

自定義了leftBarbuttonItem左滑返回手勢失效了怎麼辦?

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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劃到頂怎麼辦?

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self.automaticallyAdjustsScrollViewInsets = NO;

鍵盤事件寫的好煩躁,都想摔鍵盤了,怎麼辦?

1.買個結實的鍵盤.

2.使用IQKeyboardManager(github上可搜尋),用完之後腰也不疼了,腿也不酸了.

為什麼我的app老是不流暢,到底哪裡出了問題?

如圖

03.gif

這個神器叫做:KMCGeigerCounter,快去github搬運吧.

怎麼在不新建一個Cell的情況下調整separaLine的位置?

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

怎麼點選self.view就讓鍵盤收起,需要新增一個tapGestures麼?

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

怎麼給每個ViewController設定預設的背景圖片?

使用基類啊,少年。

想在程式碼裡改在xib裡新增的layoutAttributes,但是怎麼用程式碼找啊?

像拉button一樣的拉你的約束.nslayoutattribute也是可以拉線的.

怎麼像safari一樣滑動的時候隱藏navigationbar?

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navigationController.hidesBarsOnSwipe = Yes

導航條返回鍵帶的title太討厭了,怎麼讓它消失!

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

CoreData用起來好煩,語法又臭又長,怎麼辦?

MagicRecord

CollectionView 怎麼實現tableview那種懸停的header?

CSStickyHeaderFlowLayou

能不能只用一個pan手勢來代替UISwipegesture的各個方向?

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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;
}
}

拉伸圖片的時候怎麼才能讓圖片不變形？
1.UIImage *image = [[UIImage imageNamed:@"xxx"] stretchableImageWithLeftCapWidth:10 topCapHeight:10];

2.

05.gif


怎麼播放GIF的時候這麼卡，有沒有好點的庫？

FlipBoard出品的太適合你了：https://github.com/Flipboard/FLAnimatedImage

怎麼一句話新增上拉重新整理？

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];

怎麼把tableview裡cell的小對勾的顏色改成別的顏色？

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_mTableView.tintColor = [UIColor redColor];

04.png

本來我的statusbar是lightcontent的，結果用UIImagePickerController會導致我的statusbar的樣式變成黑色，怎麼辦？

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

怎麼把我的navigationbar弄成透明的而不是帶模糊的效果？

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

怎麼改變uitextfield placeholder的顏色和位置？

繼承uitextfield，重寫這個方法

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

你為什麼知道這麼多奇怪的花招？

去stackoverflow刷問題啊，少年！

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