iOS开发中 常用代码整理
2016-03-17 09:02
651 查看
1.设置label的圆角
//设置layer的圆角 label.layer.cornerRadias = 角度; //减掉超出主层的部分 label.layer.masksToBounds = YES; label.layer.clipsToBounds = YES;
2.设置日期格式
获取一个日期时间转化器(可以把日期对象转换成字符串对象,也可以把字符串对象转换成日期对象) NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; 设置你要的日期格式 时间格式:yyyy-MM-dd hh(HH):mm:ss formatter.dateFormat = @"今天HH:mm";
3.帧动画
//设置序列帧动画的图片数组 self.imageview.animationImages = self.images; //设置执行时间 self.imageview.animationDuration = 0.2; //设置重复次数 默认为0 无限次 self.imageview.animationRepeatCount = 0; //启动动画 [self.imageview startAnimating];
4.弹出提示
//创建窗口 返回值为UIAlertController *obj1 + (instancetype)alertControllerWithTitle:窗口功能 message:窗口提示 preferredStyle:窗口类型preferredStyle; //添加窗口选项 返回值为UIAlertAction *obj2 + (instancetype)actionWithTitle:选项 style:类型 handler:(void (^ __nullable)(UIAlertAction *action))handler; //弹出窗口 是否需要动画 [self presentViewController:obj1 animated:是/否 completion:nil];
5.定时器
//启动定时器: 1. timerWithTimeInterval:(时间)ti invocation:(任务设置)invocation repeats:(BOOL)yesOrNo; 2. timerWithTimeInterval:(时间)ti target:(调用后续方法的对象)aTarget selector:(SEL类型的方法)aSelector userInfo:(nullable id)userInfo repeats:(BOOL)yesOrNo; 1,2需要调用- (void)fire方法开始计时; scheduledTimerWithTimeInterval:(时间)ti invocation:(任务设置)invocation repeats:(BOOL)yesOrNo; scheduledTimerWithTimeInterval:(时间)ti target:(调用后续方法的对象)aTarget selector:(SEL类型的方法)aSelector userInfo:(nullable id)userInfo repeats:(BOOL)yesOrNo; //动画效果图片滚动 [self.scrollView setContentOffset:CGPointMake(x, y) animated:YES]; //停止定时器: - (void)invalidate;
6.判断邮箱格式是否正确的代码
//利用正则表达式验证 -(BOOL)isValidateEmail:(NSString *)email { NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"; NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES%@",emailRegex]; return [emailTest evaluateWithObject:email]; }
7.图片压缩
用法:UIImage *yourImage= [self imageWithImageSimple:image scaledToSize:CGSizeMake(210.0, 210.0)]; //压缩图片 - (UIImage*)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize { // Create a graphics image context UIGraphicsBeginImageContext(newSize); // Tell the old image to draw in this newcontext, with the desired // new size [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)]; // Get the new image from the context UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext(); // End the context UIGraphicsEndImageContext(); // Return the new image. return newImage; }
8.亲测可用的图片上传代码
- (IBAction)uploadButton:(id)sender { UIImage *image = [UIImage imageNamed:@"1.jpg"]; //图片名 NSData *imageData = UIImageJPEGRepresentation(image,0.5);//压缩比例 NSLog(@"字节数:%i",[imageData length]); // post url NSString *urlString = @"http://192.168.1.113:8090/text/UploadServlet"; //服务器地址 // setting up the request object now NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init] ; [request setURL:[NSURL URLWithString:urlString]]; [request setHTTPMethod:@"POST"]; // NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"]; NSString *contentType = [NSString stringWithFormat:@"multipart/form-data;boundary=%@",boundary]; [request addValue:contentType forHTTPHeaderField: @"Content-Type"]; // NSMutableData *body = [NSMutableData data]; [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]]; [body appendData:[[NSString stringWithString:@"Content-Disposition:form-data; name=\"userfile\"; filename=\"2.png\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; //上传上去的图片名字 [body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; [body appendData:[NSData dataWithData:imageData]]; [body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]]; [request setHTTPBody:body]; // NSLog(@"1-body:%@",body); NSLog(@"2-request:%@",request); NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding]; NSLog(@"3-测试输出:%@",returnString);
9.给imageView加载图片
UIImage *myImage = [UIImage imageNamed:@"1.jpg"]; [imageView setImage:myImage]; [self.view addSubview:imageView];
10.对图库的操作
//选择相册: UIImagePickerControllerSourceTypesourceType=UIImagePickerControllerSourceTypeCamera; if (![UIImagePickerControllerisSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { sourceType=UIImagePickerControllerSourceTypePhotoLibrary; } UIImagePickerController * picker = [[UIImagePickerControlleralloc]init]; picker.delegate = self; picker.allowsEditing=YES; picker.sourceType=sourceType; [self presentModalViewController:picker animated:YES]; //选择完毕: -(void)imagePickerController:(UIImagePickerController*)pickerdidFinishPickingMediaWithInfo:(NSDictionary *)info { [picker dismissModalViewControllerAnimated:YES]; UIImage * image=[info objectForKey:UIImagePickerControllerEditedImage]; [self performSelector:@selector(selectPic:) withObject:imageafterDelay:0.1]; } -(void)selectPic:(UIImage*)image { NSLog(@"image%@",image); imageView = [[UIImageView alloc] initWithImage:image]; imageView.frame = CGRectMake(0, 0, image.size.width, image.size.height); [self.viewaddSubview:imageView]; [self performSelectorInBackground:@selector(detect:) withObject:nil]; } detect为自己定义的方法,编辑选取照片后要实现的效果 //取消选择: -(void)imagePickerControllerDIdCancel:(UIImagePickerController*)picker { [picker dismissModalViewControllerAnimated:YES]; }
11.跳到下个View
nextWebView = [[WEBViewController alloc] initWithNibName:@"WEBViewController" bundle:nil]; [self presentModalViewController:nextWebView animated:YES]; //创建一个UIBarButtonItem右边按钮 UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:@"右边" style:UIBarButtonItemStyleDone target:self action:@selector(clickRightButton)]; [self.navigationItem setRightBarButtonItem:rightButton]; 设置navigationBar隐藏 self.navigationController.navigationBarHidden = YES;// iOS开发之UIlabel多行文字自动换行 (自动折行) UIView *footerView = [[UIView alloc]initWithFrame:CGRectMake(10, 100, 300, 180)]; UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(10, 100, 300, 150)]; label.text = @"Hello world! Hello world!Hello world! Hello world! Hello world! Hello world! Hello world! Hello world!Hello world! Hello world! Hello world! Hello world! Hello world! Helloworld!"; //背景颜色为红色 label.backgroundColor = [UIColor redColor]; //设置字体颜色为白色 label.textColor = [UIColor whiteColor]; //文字居中显示 label.textAlignment = UITextAlignmentCenter; //自动折行设置 label.lineBreakMode = UILineBreakModeWordWrap; label.numberOfLines = 0;
12.代码生成button
CGRect frame = CGRectMake(0, 400, 72.0, 37.0); UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; button.frame = frame; [button setTitle:@"新添加的按钮" forState: UIControlStateNormal]; button.backgroundColor = [UIColor clearColor]; button.tag = 2000; [button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button];
13.让某个控件在View的中心位置显示
(某个控件,比如label,View)label.center = self.view.center;
14.好看的文字处理
以tableView中cell的textLabel为例子: cell.backgroundColor = [UIColorscrollViewTexturedBackgroundColor]; //设置文字的字体 cell.textLabel.font = [UIFont fontWithName:@"AmericanTypewriter" size:100.0f]; //设置文字的颜色 cell.textLabel.textColor = [UIColor orangeColor]; //设置文字的背景颜色 cell.textLabel.shadowColor = [UIColor whiteColor]; //设置文字的显示位置 cell.textLabel.textAlignment = UITextAlignmentCenter;
15.隐藏Status Bar
读者可能知道一个简易的方法,那就是在程序的viewDidLoad中加入 [[UIApplication sharedApplication]setStatusBarHidden:YES animated:NO];
16.更改AlertView背景
UIAlertView *theAlert = [[[UIAlertViewalloc] initWithTitle:@"Atention" message: @"I'm a Chinese!" delegate:nil cancelButtonTitle:@"Cancel" otherButtonTitles:@"Okay",nil] autorelease]; [theAlert show]; UIImage *theImage = [UIImageimageNamed:@"loveChina.png"]; theImage = [theImage stretchableImageWithLeftCapWidth:0topCapHeight:0]; CGSize theSize = [theAlert frame].size; UIGraphicsBeginImageContext(theSize); [theImage drawInRect:CGRectMake(5, 5, theSize.width-10, theSize.height-20)];//这个地方的大小要自己调整,以适应alertview的背景颜色的大小。 theImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); theAlert.layer.contents = (id)[theImage CGImage];
17.键盘透明
textField.keyboardAppearance = UIKeyboardAppearanceAlert; 状态栏的网络活动风火轮是否旋转 [UIApplication sharedApplication].networkActivityIndicatorVisible,默认值是NO。
18.截取屏幕图片
//创建一个基于位图的图形上下文并指定大小为CGSizeMake(200,400) UIGraphicsBeginImageContext(CGSizeMake(200,400)); //renderInContext 呈现接受者及其子范围到指定的上下文 [self.view.layer renderInContext:UIGraphicsGetCurrentContext()]; //返回一个基于当前图形上下文的图片 UIImage *aImage = UIGraphicsGetImageFromCurrentImageContext(); //移除栈顶的基于当前位图的图形上下文 UIGraphicsEndImageContext(); //以png格式返回指定图片的数据 imageData = UIImagePNGRepresentation(aImage);
19.更改cell选中的背景
UIView *myview = [[UIView alloc] init]; myview.frame = CGRectMake(0, 0, 320, 47); myview.backgroundColor = [UIColorcolorWithPatternImage:[UIImage imageNamed:@"0006.png"]]; cell.selectedBackgroundView = myview;
20.显示图像
CGRect myImageRect = CGRectMake(0.0f, 0.0f, 320.0f, 109.0f); UIImageView *myImage = [[UIImageView alloc] initWithFrame:myImageRect]; [myImage setImage:[UIImage imageNamed:@"myImage.png"]]; myImage.opaque = YES; //opaque是否透明 [self.view addSubview:myImage];
21.能让图片适应框的大小
NSString*imagePath = [[NSBundle mainBundle] pathForResource:@"XcodeCrash"ofType:@"png"]; UIImage *image = [[UIImage alloc]initWithContentsOfFile:imagePath]; UIImage *newImage= [image transformWidth:80.f height:240.f]; UIImageView *imageView = [[UIImageView alloc]initWithImage:newImage]; [newImagerelease]; [image release]; [self.view addSubview:imageView];
22.实现点击图片进行跳转的代码:生成一个带有背景图片的button,给button添加点击事件
UIButton *imgButton=[[UIButton alloc]initWithFrame:CGRectMake(0, 0, 120, 120)]; [imgButton setBackgroundImage:(UIImage *)[self.imgArray objectAtIndex:indexPath.row] forState:UIControlStateNormal]; imgButton.tag=[indexPath row]; [imgButton addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
最近才开始往github上放东西 在公司写的又不能放= = 大家姑且看看吧
github地址: https://github.com/FuThD相关文章推荐
- 峰回路转,Firefox 浏览器即将重返 iOS 平台
- 峰回路转,Firefox 浏览器即将重返 iOS 平台
- 不可修补的 iOS 漏洞可能导致 iPhone 4s 到 iPhone X 永久越狱
- iOS 12.4 系统遭黑客破解,漏洞危及数百万用户
- 每日安全资讯:NSO,一家专业入侵 iPhone 的神秘公司
- [转][源代码]Comex公布JailbreakMe 3.0源代码
- 讲解iOS开发中基本的定位功能实现
- iOS中定位当前位置坐标及转换为火星坐标的方法
- js判断客户端是iOS还是Android等移动终端的方法
- iOS应用中UISearchDisplayController搜索效果的用法
- IOS开发环境windows化攻略
- iOS应用中UITableView左滑自定义选项及批量删除的实现
- 浅析iOS应用开发中线程间的通信与线程安全问题
- 检测iOS设备是否越狱的方法
- .net平台推送ios消息的实现方法
- 探讨Android与iOS,我们将何去何从?
- Android、iOS和Windows Phone中的推送技术详解
- iOS推送的那些事
- IOS 改变键盘颜色代码