12.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];}13.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;}14.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 = http://www.mamicode.com/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 =http://www.mamicode.com/ [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];    NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];    NSLog(@"3-测试输出：%@",returnString);    15.给imageView加载图片    UIImage *myImage = [UIImage imageNamed:@"1.jpg"];    [imageView setImage:myImage];    [self.view addSubview:imageView];    16.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];    }    17.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;    30.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];    31.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;    32.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;    33. ———————-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];    33. 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];    34. 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。        35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 =http://www.mamicode.com/ UIImagePNGRepresentation(aImage);    36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;    37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];    38.能让图片适应框的大小（没有确认）    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];    39.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绑定想要的事件！    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];