IOS开发常用的代码块

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1.使用定位时需要设置的权限

如果需要仅在前台定位,你在调用startUpdatingLocation 前需要调用 requestWhenInUseAuthorization 如果需要在后台定位,你在调用startUpdatingLocation前需要调用requestAlwaysAuthorization在plist文件中添加NSLocationWhenInUseUsageDescription或(与)NSLocationAlwaysUsageDescription字段:找到info.plist文件->右击->Open As->Source Code->在尾部的标签之前添加以下一个或两个:NSLocationWhenInUseUsageDescription需要定位NSLocationAlwaysUsageDescription需要定位

2.当button或者label上面的字数过多,想显示部分文字,后面的文字显示省略号的代码

self.locationBtn.titleLabel?.lineBreakMode = .ByTruncatingTail

3.IOS中设置button的时候,如果给button设置图片和文字,默认的是图片在左,文字在右,实现图片在右,文字在左的效果

self.shouBtn.imageEdgeInsets = UIEdgeInsetsMake(0, 30, 0, -30)self.shouBtn.titleEdgeInsets = UIEdgeInsetsMake(0, -10, 0, 10)

4.textField限制小数点后俩位(该方法写在TextField代理方法中(shouldChangeCharactersInRange))

let newString = (textField.text! as NSString).stringByReplacingCharactersInRange(range, withString: string) let expression = "^[0-9]*((\\.)[0-9]{0,2})?$" let regex = try! NSRegularExpression(pattern: expression, options: NSRegularExpressionOptions.AllowCommentsAndWhitespace) let numberOfMatches = regex.numberOfMatchesInString(newString, options:NSMatchingOptions.ReportProgress, range: NSMakeRange(0, (newString as NSString).length))

5.字体下面加下划线的代码

let content  = NSMutableAttributedString.init(string:"以上代金券可用于分发给您的用户,如何获得以及如何分发给用户,请点击")content.addAttribute(NSUnderlineStyleAttributeName, value:  NSNumber(long: NSUnderlineStyle.StyleSingle.rawValue), range: NSMakeRange(2,5))content.addAttribute(NSForegroundColorAttributeName, value:  blue_color, range: NSMakeRange(2,5))content.addAttribute(NSUnderlineColorAttributeName, value:  blue_color, range: NSMakeRange(2,5))mess.attributedText = content

6.调用系统电话打电话代码

let callWebView = UIWebView()let tel = “18020009876”let telStr = String(format:"tel://%@",tel!)let url = NSURL(string: telStr)callWebView.loadRequest(NSURLRequest(URL: url!))self.view.addSubview(callWebView)

7.使用工具reveal时,将静态包拖入工程,并且在build setting中的other linker flags中添加-ObjC -lz -framework Reveal字段

8.swift中label自适应高度的代码(特别注意:手动设置的字体和xib中的字体保持一致)

let size = CGSize(width: ScreenW - 16,height:CGFloat(MAXFLOAT))rect = data.ac_description.boundingRectWithSize(size, options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: NSDictionary(object:UIFont.systemFontOfSize(13), forKey: NSFontAttributeName) as? [String : AnyObject], context: nil)

9.手机号判断

let phoneRegex = "^1[0-9]{10}$” //正则 let phoneText = NSPredicate(format:"SELF MATCHES %@",phoneRegex) if phoneText.evaluateWithObject(telephoneText) == false  {            HUD.hidden = false            HUD.labelText = "请输入正确的手机号"            HUD.hide(true, afterDelay: 1)        }

10.获取图片格式的代码

func typeForImageData(data:AnyObject)->NSString {    var c = uint_fast8_t()    data.getBytes(&c, length: 1)    switch (c) {    case 0x89:      return "image/png"    case 0x47:      return "image/gif"    case 0xFF:      return "image/jpeg"    case 0x4D:      return "image/tiff"    default:      return "image/jpeg"    }  }

11.UIImage转base64代码

let data = UIImageJPEGRepresentation(image!, 0.1)let encImageStr = data!.base64EncodedDataWithOptions(.Encoding64CharacterLineLength)    let str = String(data: encImageStr, encoding:NSASCIIStringEncoding)!    letstr1 = str.stringByReplacingOccurrencesOfString("\r\n", withString: "")

12.字符串分割

let str = "name=zhangsan"let array = str.componentsSeparatedByString("=")

13.隐藏手机号中间的四位号码

NSString *originTel = @"13722223333";NSString *tel = [originTel stringByReplacingCharactersInRange:NSMakeRange(3, 4) withString:@"****"];

14.设置顶部状态栏

override func preferredStatusBarStyle() -> UIStatusBarStyle {        return UIStatusBarStyle.LightContent    }

15.更改导航栏上面返回按钮的颜色和标题的字体和颜色的方法self.navigationController?.navigationBar.tintColor = UIColor.init(red: 186/255.0, green: 186/255.0, blue: 186/255.0, alpha: 1)let navigationTitleAttribute: NSDictionary = NSDictionary(object: UIColor.init(red: 38/255.0, green: 38/255.0, blue: 38/255.0, alpha: 1.0), forKey: NSForegroundColorAttributeName)self.navigationController?.navigationBar.titleTextAttributes = navigationTitleAttribute as? [String : AnyObject]

16.当URL中有转移字符或者有中文的时候,使用如下方法对其进行转义

1.url编码ios中http请求遇到汉字的时候,需要转化成UTF-8,用到的方法是:NSString * encodingString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

2.url解码请求后,返回的数据,如果显示的是这样的格式:%3A%2F%2F,此时需要我们进行UTF-8解码,用到的方法是:NSString *str = [model.album_name stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

17.将数组或者字典转换为json串的方法如下

let dic = NSMutableDictionary()dic.setValue("123", forKey: "direct1")dic.setValue("30", forKey: "money")let dic1 = NSMutableDictionary()dic1.setValue("123", forKey: "direct1")dic1.setValue("456", forKey: "direct2")dic1.setValue("50", forKey: "money")let dic2 = NSMutableDictionary()dic2.setValue("123", forKey: "direct1")dic2.setValue("456", forKey: "direct2")dic2.setValue("789", forKey: "direct3")dic2.setValue("100", forKey: "money")let array = [dic,dic1,dic2]let data = try! NSJSONSerialization.dataWithJSONObject(array, options: NSJSONWritingOptions.PrettyPrinted)goodsList = String(data: data, encoding: NSUTF8StringEncoding)!

18.将时间戳转换为字符串的代码

let string = NSString(string: self.data.createDate!)let time:NSTimeInterval = string.doubleValuelet formatter = NSDateFormatter()formatter.dateFormat = "yyyy-MM-dd"let date = NSDate(timeIntervalSince1970: time)self.dateLabel.text = formatter.stringFromDate(date)

19.swift中如何获取当前月份的代码

let currentDate = NSDate()let dateFormatter = NSDateFormatter()dateFormatter.dateFormat = "MM"let dateString = dateFormatter.stringFromDate(currentDate)

20.将系统时间转换为时间戳的代码

let date = NSDate()

let datsStr = date.timeIntervalSince1970

21.使用cocoaPods导入第三方库

platform :ios, '8.0'

use_frameworks!

target 'ylAppiOSnative' do          //单引号里面的内容是工程名pod 'AFNetworking','~> 3.1.0'

pod 'Masonry','~> 1.0.0'

pod 'MJRefresh', '~> 3.1.0'

pod 'MBProgressHUD', '~> 0.9.2'

pod 'SDWebImage','~> 3.7.5'

pod 'SDCycleScrollView','~> 1.62'

end

22.改变textField的placeholder颜色的方法

_consigneeField.placeholder = @"请输入收货人姓名";

[_consigneeField setValue:[UIColor colorWithRed:115/255.0 green:115/255.0 blue:115/255.0 alpha:1.0] forKeyPath:@"_placeholderLabel.textColor"];[_consigneeField setValue:[UIFont systemFontOfSize:14] forKeyPath:@"_placeholderLabel.font"];

 

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未经允许不得转载:作者:SheaYang, 转载或复制请以 超链接形式 并注明出处 技术狗|博客
原文地址:《IOS开发常用的代码块》 发布于2019-10-06

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