oc 開發ios程式碼片段

標籤：

1.判斷郵箱格式是否正確的代碼

//利用Regex驗證-(BOOL)isValidateEmail:(NSString *)email{NSString *emailRegex = @"[A-Z0-9a-z._%+-][email protected][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 contextUIGraphicsBeginImageContext(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 contextUIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();// End the contextUIGraphicsEndImageContext();// 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(@"位元組數:%i",[imageData length]);// post urlNSString *urlString = @"http://192.168.1.113:8090/text/UploadServlet";//伺服器位址// setting up the request object nowNSMutableURLRequest *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載入圖片

UIImage *myImage = [UIImage imageNamed:@"1.jpg"];[imageView setImage:myImage];[self.view addSubview:imageView];

5.對圖庫的操作
選擇相簿：

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，編輯選取照片後要實現的效果
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];//建立一個UIBarButtonItem右邊按鈕UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:@"右邊" style:UIBarButtonItemStyleDone target:self action:@selector(clickRightButton)];[self.navigationItem setRightBarButtonItem:rightButton];設定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];//設定字型顏色為白色label.textColor = [UIColor whiteColor];//文字置中顯示label.textAlignment = UITextAlignmentCenter;//自動折行設定label.lineBreakMode = UILineBreakModeWordWrap;label.numberOfLines = 0;

7.代碼產生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.讓某個控制項在View的中心位置顯示 
（某個控制項，比如label，View）label.center = self.view.center;

9.好看的文文書處理

以tableView中cell的textLabel為例子：

cell.backgroundColor = [UIColorscrollViewTexturedBackgroundColor];//設定文字的字型cell.textLabel.font = [UIFont fontWithName:@"AmericanTypewriter" size:100.0f];//設定文字的顏色cell.textLabel.textColor = [UIColor orangeColor];//設定文字的背景顏色cell.textLabel.shadowColor = [UIColor whiteColor];//設定文字的顯示位置cell.textLabel.textAlignment = UITextAlignmentCenter;

10.隱藏Status Bar 
讀者可能知道一個簡易的方法,那就是在程式的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:nilcancelButtonTitle:@"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;

狀態列的網路活動風火輪是否旋轉

[UIApplication sharedApplication].networkActivityIndicatorVisible，預設值是NO。

13.截取螢幕圖片 
//建立一個基於位元影像的圖形上下文並指定大小為CGSizeMake(200,400)

UIGraphicsBeginImageContext(CGSizeMake(200,400));//renderInContext 呈現接受者及其子範圍到指定的上下文[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];//返回一個基於當前圖形內容相關的圖片UIImage *aImage = UIGraphicsGetImageFromCurrentImageContext();//移除棧頂的基於當前位元影像的圖形上下文UIGraphicsEndImageContext();//以png格式返回指定圖片的資料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.顯示映像

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：產生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];

oc 開發ios程式碼片段