iOS开发的一些奇巧淫技


利用线程延迟操作
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(NSEC_PER_SEC *3)), dispatch_get_main_queue(), ^{
});

tableViewcell高度自适应--->
self.stepTableView.rowHeight = UITableViewAutomaticDimension;
self.stepTableView.estimatedRowHeight = 350;
return self.stepTableView.rowHeight;

1.pch文件共享工程时不兼容怎么办?打开Xcode然后在target的build setting中搜索fix文件,把pch文件前缀(倒数第二个/之前)全删了,改成$(SRCROOT)

iOS开发的一些奇巧淫技_第1张图片
pch文件更改.png
http://www.cocoachina.com/ios/20141229/10783.html

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.

01.png

很简单.

self.tableView.tableFooterView = [[UIView alloc] init];
试过的都说好.

加完这句之后就变成了这样.

02.png

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

03.gif

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。

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?

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

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?

  • (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];

05.gif

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];
04.png

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];
    }

20160313 - tableview的cell选中之后发现选中的那个颜色一致存在好难看怎么办?

方法里加上这句[tableView deselectRowAtIndexPath:indexPath animated:YES];效果杠杠的

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