Swift日常开发随笔
1、修改UISearchBar的搜索框底色
使用以下代码： setSearchFieldBackgroundImage(CommonUseClass._sharedManager.imageFromColor(color: .white, viewSize: CGSize(width: self.bounds.size.width, height: self.bounds.size.height)), for: .normal) //颜色创建图片 func imageFromColor(color: UIColor, viewSize: CGSize) -> UIImage{ let rect: CGRect = CGRect(x: 0, y: 0, width: viewSize.width, height: viewSize.height) UIGraphicsBeginImageContext(rect.size) let context: CGContext = UIGraphicsGetCurrentContext()! context.setFillColor(color.cgColor) context.fill(rect) let image = UIGraphicsGetImageFromCurrentImageContext() UIGraphicsGetCurrentContext() return image! }
2、修改UITextField的placeholderLabel的默认字体颜色
inputTextField.text = "123" //备注：因为苹果公司开发过程中使用的是懒加载，所以如果不提前进行设置储值，则不会创建“_placeholderLabel”,仅仅使用以下代码不会进行更改默认字体颜色 inputTextField.setValue(colorWithHexString("0x999999"), forKeyPath: "_placeholderLabel.textColor")
3、为UICollectionView添加headerView
//备注：UICollectionView跟UITableView在设置headerView时有少许的差别。UICollection使用的是一个UICollectionReusableView来进行创建 collectionView.register(UICollectionReusableView, forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: "UICollectionReusableView") //实现代理方法 func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView { let headerView = collectionView.dequeueReusableSupplementaryView(ofKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier:"UICollectionReusableView", for: indexPath) headerView.addSubview(contentSearchBar) return headerView } //起初时候使用上面的代理方法不知道为何没有执行，后来设置了以下值发现竟然OK了，也不知道为啥，反正就用了。 layout.headerHeight = 70
4、自定义轮播图的UIPageControl
//创建轮播视图 class NACustomBannerView: UIView, UIScrollViewDelegate { var timeInterval: TimeInterval = 1 private var imageUrls: [String] = [String]() private var imageArray: [UIImageView] = [UIImageView]() private var tapAction: (Int) -> Void private var currentIndex: Int = 0 private weak var timer: Timer? private lazy var scrollNode: UIScrollView = { let node = UIScrollView() node.scrollsToTop = false node.isPagingEnabled = true node.bounces = false node.frame = self.bounds node.delegate = self node.showsHorizontalScrollIndicator = false node.decelerationRate = UIScrollView.DecelerationRate(rawValue: 1) node.setContentOffset(CGPoint(x: self.frame.width, y: 0), animated: false) node.contentSize = CGSize(width: self.frame.size.width * 3.0, height: 0) return node }() lazy var pageControl: NACustomBannerPageControl = { let node = NACustomBannerPageControl(frame: CGRect(x: Int(UIScreen.main.bounds.width / 2 - 40), y: Int(self.frame.height - 15), width: 10 * self.imageUrls.count , height: 10)) node.numberOfPages = self.imageUrls.count return node }() // MARK: - Public func resetCurrentPage(_ page: Int) { currentIndex = page pageControl.currentPage = page resetImageView() startTimer() } // MARK: - Init init(frame: CGRect, imageUrls: [String], tapAction action: @escaping(Int) -> Void) { self.imageUrls = imageUrls self.tapAction = action super.init(frame: frame) addImageView() addSubview(scrollNode) addSubview(pageControl) startTimer() } required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented") } // MARK: - UIScrollViewDelegate func scrollViewDidScroll(_ scrollView: UIScrollView) { let contentOffsetX = scrollView.contentOffset.x // 设置图片信息 if contentOffsetX == 2 * scrollView.frame.width {// 左滑 currentIndex = getActualCurrentPage(calculatedPage: currentIndex + 1) resetImageView() } else if (contentOffsetX == 0) {// 右滑 currentIndex = getActualCurrentPage(calculatedPage: currentIndex - 1) resetImageView() } // 设置 pageControl if contentOffsetX < scrollView.frame.width && contentOffsetX > 0 { if contentOffsetX <= scrollView.frame.width * 0.5 { pageControl.currentPage = getActualCurrentPage(calculatedPage: currentIndex - 1) } else if contentOffsetX > scrollView.frame.width * 0.5 { pageControl.currentPage = getActualCurrentPage(calculatedPage: currentIndex) } } else if contentOffsetX > scrollView.frame.width && contentOffsetX < scrollView.frame.width * 2 { if contentOffsetX >= scrollView.frame.width * 1.5 { pageControl.currentPage = getActualCurrentPage(calculatedPage: currentIndex + 1) } else if contentOffsetX < scrollView.frame.width * 1.5 { pageControl.currentPage = currentIndex } } } func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) { scrollView.setContentOffset(CGPoint(x: self.frame.width, y: 0), animated: true) startTimer() } func scrollViewWillBeginDragging(_ scrollView: UIScrollView) { timer?.invalidate() timer = nil } // MARK: - Action @objc fileprivate func cycleViewDidClick(gesture: UITapGestureRecognizer) { print("点击了第\(currentIndex)张图") let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: frame.width, height: frame.height)) imageView.kf.setImage(with: URL(string: imageUrls[currentIndex])) tapAction(currentIndex) } @objc fileprivate func autoScroll() { if imageUrls.count < 2 { return } scrollNode.setContentOffset(CGPoint(x: self.frame.width * 2, y: 0), animated: true) } func startTimer() { guard imageUrls.count > 0 else { return } if let myTimer = timer { myTimer.invalidate() timer = nil } timer = Timer.scheduledTimer(timeInterval: self.timeInterval, target: self, selector: #selector(autoScroll), userInfo: nil, repeats: true) RunLoop.current.add(timer!, forMode: RunLoop.Mode.common) } func invalidateTimer() { timer?.invalidate() timer = nil } fileprivate func addImageView() { var x: CGFloat = 0 var pageIndex: NSInteger = self.imageUrls.count - 1 for index in 0..<3 { let imgNode = UIImageView() x = CGFloat(index) * frame.width imgNode.frame = CGRect(x: x, y: 0, width: frame.width, height: frame.height) imgNode.kf.setImage(with: URL(string: imageUrls.count == 0 ? "" : (imageUrls[pageIndex]))) imgNode.contentMode = .scaleAspectFill imgNode.clipsToBounds = true let gesture = UITapGestureRecognizer(target: self, action: #selector(cycleViewDidClick(gesture:))) imgNode.addGestureRecognizer(gesture) imgNode.isUserInteractionEnabled = true imageArray.append(imgNode) scrollNode.addSubview(imgNode) if imageUrls.count == 1 { pageIndex = 0 scrollNode.isScrollEnabled = false } else { pageIndex = index == 0 ? 0 : 1 } } } fileprivate func resetImageView(){ let preIndex: NSInteger = getActualCurrentPage(calculatedPage: currentIndex - 1) let nextIndex: NSInteger = getActualCurrentPage(calculatedPage: currentIndex + 1) if imageUrls.count == 0 { return } imageArray[0].kf.setImage(with: URL(string: imageUrls[preIndex])) imageArray[1].kf.setImage(with: URL(string: imageUrls[currentIndex])) imageArray[2].kf.setImage(with: URL(string: imageUrls[nextIndex])) scrollNode.contentOffset = CGPoint(x: self.frame.width, y: 0) } fileprivate func getActualCurrentPage(calculatedPage page: NSInteger) -> NSInteger { if page == imageUrls.count { return 0 } else if page == -1 { return imageUrls.count - 1 } else { return page } } }
import UIKit class NACustomBannerPageControl: UIView { let pageControlDiameter: Float = 5 var currentPage: NSInteger = 0 { didSet { if oldValue == currentPage { return } if currentPage < oldValue {// 向右拉伸 UIView.animate(withDuration: 0.3, animations: { for dot in self.subviews { var dotFrame = dot.frame if dot.tag == self.currentPage { dotFrame.size.width = CGFloat(self.pageControlDiameter * 2.0) dot.backgroundColor = colorWithHexString("0xfdd000") dot.frame = dotFrame } else if dot.tag <= oldValue && dot.tag > self.currentPage { dotFrame.origin.x += CGFloat(self.pageControlDiameter) dotFrame.size.width = CGFloat(self.pageControlDiameter) dot.backgroundColor = .white dot.frame = dotFrame } } }) } else { UIView.animate(withDuration: 0.3, animations: { for dot in self.subviews { var dotFrame = dot.frame if dot.tag == self.currentPage { dotFrame.size.width = CGFloat(self.pageControlDiameter * 2.0) dotFrame.origin.x -= CGFloat(self.pageControlDiameter) dot.backgroundColor = colorWithHexString("0xfdd000") dot.frame = dotFrame } else if dot.tag > oldValue && dot.tag < self.currentPage { dotFrame.origin.x -= CGFloat(self.pageControlDiameter) dot.frame = dotFrame } else if dot.tag == oldValue { dotFrame.size.width = CGFloat(self.pageControlDiameter) dot.backgroundColor = .white dot.frame = dotFrame } } }) } } } var numberOfPages: NSInteger = 0 { didSet { if self.numberOfPages == 0 { return } if self.subviews.count > 0 { for view in self.subviews { view.removeFromSuperview() } } var dotX: Float = 0; var dotW: Float = pageControlDiameter; var bgColor: UIColor for i in 0..<numberOfPages { if i <= currentPage { dotX = pageControlDiameter * 2.0 * Float(i) } else { dotX = pageControlDiameter * 2 * Float(i) + pageControlDiameter } if i == currentPage { dotW = pageControlDiameter * 2; bgColor = colorWithHexString("0xfdd000") } else { dotW = pageControlDiameter; bgColor = .white } let temp = UIView() temp.frame = CGRect(x: CGFloat(dotX), y: CGFloat(0), width: CGFloat(dotW), height: CGFloat(pageControlDiameter)) temp.layer.cornerRadius = CGFloat(pageControlDiameter * 0.5) temp.layer.masksToBounds = true temp.backgroundColor = bgColor temp.tag = i addSubview(temp) } } } }
func setUpTurnsChangeItem() -> Void { let x = (SCREEN_WIDTH - 335)/2 let frame = CGRect(x: x, y: CGFloat(21), width: 335, height: 170) let urls = ["http://p.lrlz.com/data/upload/mobile/special/s252/s252_05471521705899113.png", "http://p.lrlz.com/data/upload/mobile/special/s303/s303_05442007678060723.png", "http://p.lrlz.com/data/upload/mobile/special/s303/s303_05442007587372591.png", "http://p.lrlz.com/data/upload/mobile/special/s303/s303_05442007388249407.png", "http://p.lrlz.com/data/upload/mobile/special/s303/s303_05442007470310935.png"] cycleScrollView = NACustomBannerView(frame: frame, imageUrls: urls) { (index) in print("当前第\(index)张") } cycleScrollView.layer.masksToBounds = true cycleScrollView.layer.cornerRadius = 5.0 container.addSubview(cycleScrollView) }
效果图如下：
5、自定义下拉列表
import UIKit class NACustomDropListView: UIView,UITableViewDelegate,UITableViewDataSource{ fileprivate var cellid = "cellid" lazy var titleArray = [String]() lazy var tableArray = [[String]]() var screenWidth = SCREEN_WIDTH var screenHeight = SCREEN_HEIGHT var maskViewSS:UIView? var selectClosure:((_ tag:Int,_ row:Int)->Void)? init(frame: CGRect,tableArr:[[String]],selectClosure : @escaping (_ tag:Int,_ row:Int)->Void) { super.init(frame: frame) self.titleArray = tableArr.map({ (arr) -> String in return arr[0] }) self.tableArray = tableArr self.selectClosure = selectClosure self.backgroundColor = UIColor.white self.setTitleButton() setMaskView() setTableView() } required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented") } func setMaskView(){ let height = Int(Int(SCREEN_HEIGHT) - 40 - Int(CommonUseClass._sharedManager.navigationBarHeight())) maskViewSS = UIView.init(frame: CGRect(x: 0, y: 40, width: Int(screenWidth), height:height)) maskViewSS?.backgroundColor = newColorWithAlpha(0, 0, 0, 0.3) let tap = UITapGestureRecognizer.init(target: self, action: #selector(tapAction)) maskViewSS?.alpha = 0 maskViewSS?.addGestureRecognizer(tap) } @objc func tapAction(){ for i in 0..<self.tableArray.count{ let tableView = self.viewWithTag(100+i) as! UITableView let drop = self.viewWithTag(1000+i) as! NACustomDropListTitleView if tableView.frame.height>1{ drop.isSelected = false UIView.animate(withDuration: 0.2, animations: { tableView.frame = CGRect.init(x: 0, y: 40, width: UIScreen.main.bounds.width, height: 1) self.maskViewSS?.alpha = 0 }, completion: { (idCom) in self.maskViewSS?.removeFromSuperview() }) } } } func setTitleButton(){ let totalArry:Array<Array<String>> = self.tableArray let width:CGFloat = screenWidth / CGFloat(titleArray.count) for i in 0..<self.titleArray.count{ let view = NACustomDropListTitleView.init(frame: CGRect.init(x: CGFloat(i)*width, y: 0, width: width, height: 44), title: titleArray[i]) view.tag = 1000+i view.gesClosure = { (select)->Void in self.insertSubview(self.maskViewSS!, at: 0) UIView.animate(withDuration: 0.2, animations: { self.maskViewSS?.alpha = 1 }) if select { for n in 0..<self.titleArray.count { let drop = self.viewWithTag(1000+n) as! NACustomDropListTitleView let tableView = self.viewWithTag(100+n) as! UITableView if i == n { drop.isSelected = true }else{ drop.isSelected = false } let arr = totalArry[n] as [String] // tableView.reloadData() if i == n { UIView.animate(withDuration: 0.2, animations: { let height2 = Int(arr.count) * 40 + 20 let height1 = Int(Int(SCREEN_HEIGHT) - 40 - Int(CommonUseClass._sharedManager.navigationBarHeight())) tableView.frame = CGRect(x: 0, y: 40, width: Int(self.screenWidth), height: height2 > height1 ? height1 : height2) }) }else{ UIView.animate(withDuration: 0.2, animations: { tableView.frame = CGRect.init(x: 0, y: 40, width: self.screenWidth, height: 1) }) } } }else{ let tableView = self.viewWithTag(100+i) as! UITableView UIView.animate(withDuration: 0.2, animations: { tableView.frame = CGRect.init(x: 0, y: 40, width: self.screenWidth, height: 1) self.maskViewSS?.alpha = 0 }, completion: { (idCom) in self.maskViewSS?.removeFromSuperview() }) } } self.addSubview(view) } } func setTableView(){ let totalArry:Array<Array<String>> = self.tableArray for i in 0..<totalArry.count{ let tableView = UITableView.init(frame: CGRect.init(x: 0, y: 40, width: screenWidth, height: 1), style: .plain) tableView.delegate = self tableView.dataSource = self tableView.tag = 100+i tableView.backgroundColor = UIColor.white tableView.register(UITableViewCell.self, forCellReuseIdentifier: cellid) tableView.rowHeight = 40 tableView.isScrollEnabled = false tableView.separatorStyle = .none self.addSubview(tableView) } } override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? { var view = super.hitTest(point, with: event) if view == nil { for subView in self.subviews { let tp = subView.convert(point, from: self) if subView.bounds.contains(tp) { view = subView } } } return view } } extension NACustomDropListView{ func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { let drop = self.viewWithTag(tableView.tag-100+1000) as! NACustomDropListTitleView let cell = tableView.cellForRow(at: indexPath) drop.title = cell?.textLabel?.text if self.selectClosure != nil { self.selectClosure!(tableView.tag,indexPath.row) } drop.isSelected = false UIView.animate(withDuration: 0.2, animations: { tableView.frame = CGRect.init(x: 0, y: 40, width: self.screenWidth, height: 1) self.maskViewSS?.alpha = 0 }, completion: { (idCom) in self.maskViewSS?.removeFromSuperview() }) } func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { let drop = self.viewWithTag(tableView.tag-100+1000) as! NACustomDropListTitleView if drop.isSelected == nil { return 0 }else{ return drop.isSelected! ? self.tableArray[tableView.tag-100].count : 0 } } func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: cellid, for: indexPath) as UITableViewCell cell.textLabel?.font = UIFont.systemFont(ofSize: 14) cell.textLabel?.text = tableArray[tableView.tag - 100][indexPath.row] return cell } }
import UIKit import SnapKit typealias GesClosure = (_ selected:Bool)->Void class NACustomDropListTitleView: UIView { var label:UILabel! var downIcon:UIImageView! var topIcon:UIImageView! var ly_width:CGFloat? var title:String?{ didSet{ self.ly_width = CommonUseClass._sharedManager.getStringRect(text: self.title!,font: UIFont.systemFont(ofSize: 16)).width + 2 label.text = self.title if title == "价格"{ centerLayoutConstraints() }else{ commponLayoutConstraints() } } } var _isSelect:Bool = false var gesClosure:GesClosure? var isSelected:Bool?{ didSet{ self._isSelect = isSelected! if isSelected! { self.downIcon.image = UIImage.init(named: "ic_down_y") self.label.textColor = colorWithHexString("0xfdd000") }else{ self.downIcon.image = UIImage.init(named: "ic_down_f") self.label.textColor = colorWithHexString("0x000000") } } } init(frame: CGRect,title:String) { super.init(frame: frame) self.title = title self.ly_width = CommonUseClass._sharedManager.getStringRect(text: self.title!,font: UIFont.systemFont(ofSize: 16)).width + 2 setUI(title: title) if title == "价格" { centerLayoutConstraints() }else{ commponLayoutConstraints() } setGes() } required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented") } func setGes(){ let ges = UITapGestureRecognizer.init(target: self, action: #selector(tapAction)) self.addGestureRecognizer(ges) } @objc func tapAction(){ self._isSelect = !self._isSelect self.isSelected = self._isSelect if (self.gesClosure != nil){ self.gesClosure!(self.isSelected!) } } func setUI(title:String){ label = UILabel() addSubview(label) label.font = UIFont.systemFont(ofSize: 16) label.textColor = colorWithHexString("0x000000") label.text = self.title downIcon = UIImageView.init() downIcon.image = UIImage.init(named:"ic_down_f") addSubview(downIcon) topIcon = UIImageView.init() topIcon.image = UIImage.init(named:"ic_down_f") addSubview(topIcon) UIView.animate(withDuration: 0.2, animations: { self.topIcon.transform = CGAffineTransform.init(rotationAngle: CGFloat(Double.pi)) }) } func labelConstraints() -> Void { label.snp.removeConstraints() downIcon.snp.removeConstraints() label.snp.makeConstraints { (make) in make.centerY.equalTo(self) make.centerX.equalTo(self) make.height.equalTo(16) make.width.equalTo(ly_width!) } } func commponLayoutConstraints(){ labelConstraints() downIcon.snp.makeConstraints { (make) in make.left.equalTo(label.snp.right).offset(2) make.centerY.equalTo(label) make.width.equalTo(12) make.height.equalTo(6) } } func centerLayoutConstraints() -> Void { labelConstraints() topIcon.snp.makeConstraints { (make) in make.left.equalTo(label.snp.right).offset(2) make.top.equalTo(label).offset(1) make.width.equalTo(12) make.height.equalTo(6) } downIcon.snp.makeConstraints { (make) in make.left.equalTo(label.snp.right).offset(2) make.bottom.equalTo(label).offset(-1) make.width.equalTo(12) make.height.equalTo(6) } } }
lazy var dropListView : NACustomDropListView = { let dropListView = NACustomDropListView.init(frame: CGRect(x: CGFloat(0), y: 0, width: SCREEN_WIDTH, height: CGFloat(44)), tableArr: [moneyArray,limitArray,sortArray], selectClosure: { (tag, row) in print(tag-100,row) }) return dropListView }() view.addSubview(dropListView)
运行效果：
提示：之所以为空白，是因为我把下拉列表中的tableView.reloadData()这行代码屏蔽掉了，加入的数组没有刷新。
6、隐藏navigationBar和tabbar的黑色分割线
//隐藏navigationBar下面的分割线 self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .any, barMetrics: .default) self.navigationController?.navigationBar.shadowImage = UIImage() //隐藏tabbar上面的分割线 self.tabBarController?.tabBar.shadowImage = UIImage.init() self.tabBarController?.tabBar.backgroundImage = UIImage.init()
7、获取导航栏+状态栏的高度
func navigationBarHeight() -> Float { var navigationBarH: Float = 64 if IS_IPHONE_X.boolValue { navigationBarH += 20 }else{ navigationBarH += 0 } return navigationBarH }
8、判断字符串是否为空
func StringIsEmpty(value: AnyObject?) -> Bool { if (nil == value) { return true }else{ if let myValue = value as? String{ return myValue == "" || myValue == "(null)" || 0 == myValue.count }else{ return true } } }
9、判断是否是整数
func isPurnInt(string: String) -> Bool { let scan: Scanner = Scanner(string: string) var val:Int = 0 return scan.scanInt(&val) && scan.isAtEnd }
10、添加阴影效果
func setShadow(view:UIView,sColor:UIColor,offset:CGSize, opacity:Float,radius:CGFloat) { view.layer.shadowColor = sColor.cgColor view.layer.shadowOpacity = opacity view.layer.shadowRadius = radius view.layer.shadowOffset = offset }
使用实例：setShadow(view: groundView, sColor: .black, offset: CGSize(width: 1, height: 1), opacity:0.15, radius: 5)
11、颜色创建图片
func imageFromColor(color: UIColor, viewSize: CGSize) -> UIImage{ let rect: CGRect = CGRect(x: 0, y: 0, width: viewSize.width, height: viewSize.height) UIGraphicsBeginImageContext(rect.size) let context: CGContext = UIGraphicsGetCurrentContext()! context.setFillColor(color.cgColor) context.fill(rect) let image = UIGraphicsGetImageFromCurrentImageContext() UIGraphicsGetCurrentContext() return image! }
12、获取字符串的宽度、高度
func getStringRect(text:String, font:UIFont) -> CGRect { let strText: NSString = NSString( string: text ) let size:CGSize = CGSize(width: 100, height: 0) let options:NSStringDrawingOptions = NSStringDrawingOptions.usesLineFragmentOrigin let boundRect = strText.boundingRect(with: size, options: options, attributes: [NSAttributedString.Key.font: font], context: nil) return boundRect }
所用代码：均是swift 4.2下运行
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