1.判斷郵箱格式是否正確的代碼 //利用正則表達式驗證 -(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]; } 2.圖片壓縮 用法：UIImage *yourImage= [self imageWithImageSimple:image scaledToSize:CGSizeMake(210.0, 210.0)]; //壓縮圖片 - (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; } 3.親測可用的圖片上傳代碼 - (IBAction)uploadButton:(id)sender { UIImage *image = [UIImage imageNamed:@"1.jpg"]; //圖片名 NSData *imageData = UIImageJPEGRepresentation(image,0.5);//壓縮比例 NSLog(@"字節數:%i",[imageData length]); // post url NSString *urlString = @"http://192.168.1.113:8090/text/UploadServlet"; //服務器地址 // 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]]; //上傳上去的圖片名字 [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-測試輸出：%@",returnString); 4.給imageView加載圖片 UIImage *myImage = [UIImage imageNamed:@"1.jpg"]; [imageView setImage:myImage]; [self.view addSubview:imageView]; 5.對圖庫的操作 選擇相冊： 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]; 選擇完畢： -(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為自己定義的方法，編輯選取照片后要實現的效果 取消選擇： -(void)imagePickerControllerDIdCancel:(UIImagePickerController*)picker { [picker dismissModalViewControllerAnimated:YES]; } 6.跳到下個View nextWebView = [[WEBViewController alloc] initWithNibName:@"WEBViewController" bundle:nil]; [self presentModalViewController:nextWebView animated:YES]; //創建一個UIBarButtonItem右邊按鈕 UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:@"右邊" style:UIBarButtonItemStyleDone target:self action:@selector(clickRightButton)]; [self.navigationItem setRightBarButtonItem:rightButton]; 設置navigationBar隱藏 self.navigationController.navigationBarHidden = YES;// iOS開發之UIlabel多行文字自動換行 （自動折行） 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!"; //背景顏色為紅色 label.backgroundColor = [UIColor redColor]; //設置字體顏色為白色 label.textColor = [UIColor whiteColor]; //文字居中顯示 label.textAlignment = UITextAlignmentCenter; //自動折行設置 label.lineBreakMode = UILineBreakModeWordWrap; label.numberOfLines = 0; 7.代碼生成button CGRect frame = CGRectMake(0, 400, 72.0, 37.0); UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; button.frame = frame; [button setTitle:@"新添加的按鈕" forState: UIControlStateNormal]; button.backgroundColor = [UIColor clearColor]; button.tag = 2000; [button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button]; 8.讓某個控件在View的中心位置顯示 （某個控件，比如label，View）label.center = self.view.center; 9.好看的文字處理 以tableView中cell的textLabel為例子： cell.backgroundColor = [UIColorscrollViewTexturedBackgroundColor]; //設置文字的字體 cell.textLabel.font = [UIFont fontWithName:@"AmericanTypewriter" size:100.0f]; //設置文字的顏色 cell.textLabel.textColor = [UIColor orangeColor]; //設置文字的背景顏色 cell.textLabel.shadowColor = [UIColor whiteColor]; //設置文字的顯示位置 cell.textLabel.textAlignment = UITextAlignmentCenter; 10.隱藏Status Bar 讀者可能知道一個簡易的方法,那就是在程序的viewDidLoad中加入 [[UIApplication sharedApplication]setStatusBarHidden:YES animated:NO]; 11.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)];//這個地方的大小要自己調整，以適應alertview的背景顏色的大小。 theImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); theAlert.layer.contents = (id)[theImage CGImage]; 12.鍵盤透明 textField.keyboardAppearance = UIKeyboardAppearanceAlert; 狀態欄的網絡活動風火輪是否旋轉 [UIApplication sharedApplication].networkActivityIndicatorVisible，默認值是NO。 13.截取屏幕圖片 //創建一個基于位圖的圖形上下文并指定大小為CGSizeMake(200,400) UIGraphicsBeginImageContext(CGSizeMake(200,400)); //renderInContext 呈現接受者及其子范圍到指定的上下文 [self.view.layer renderInContext:UIGraphicsGetCurrentContext()]; //返回一個基于當前圖形上下文的圖片 UIImage *aImage = UIGraphicsGetImageFromCurrentImageContext(); //移除棧頂的基于當前位圖的圖形上下文 UIGraphicsEndImageContext(); //以png格式返回指定圖片的數據 imageData = UIImagePNGRepresentation(aImage); 14.更改cell選中的背景 UIView *myview = [[UIView alloc] init]; myview.frame = CGRectMake(0, 0, 320, 47); myview.backgroundColor = [UIColorcolorWithPatternImage:[UIImage imageNamed:@"0006.png"]]; cell.selectedBackgroundView = myview; 15.顯示圖像 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]; 16.能讓圖片適應框的大小（沒有確認） 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]; 17.實現點擊圖片進行跳轉的代碼：生成一個帶有背景圖片的button，給button綁定想要的事件！ 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];
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