-(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

- (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; 
} 

- (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(jié)數(shù):%i",[imageData length]); 
    // post url 
    NSString *urlString = @"http://192.168.1.113:8090/text/UploadServlet"; 
    //服務(wù)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); 
} 

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

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]; 
} 

-(void)imagePickerControllerDIdCancel:(UIImagePickerController*)picker 
{ 
    [picker dismissModalViewControllerAnimated:YES]; 
} 

nextWebView = [[WEBViewController alloc] initWithNibName:@"WEBViewController" bundle:nil]; 
[self presentModalViewController:nextWebView animated:YES]; 

7.創(chuàng)建一個UIBarButton右邊按鈕

UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:@"右邊" style:UIBarButtonItemStyleDone target:self action:@selector(clickRightButton)]; 
[self.navigationItem setRightBarButtonItem:rightButton];  

self.navigationController.navigationBarHidden = YES;// 

 9.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(shè)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(shè)置 
label.lineBreakMode = UILineBreakModeWordWrap; 
label.numberOfLines = 0; 

10.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]; 

label.center = self.view.center；//（某個控件，比如label，View） 

12.自定義text各種效果：

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

[[UIApplication sharedApplication]setStatusBarHidden:YES animated:NO]; 

14.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(diào)整，以適應(yīng)alertview的背景顏色的大小。 
   theImage = UIGraphicsGetImageFromCurrentImageContext();    
   UIGraphicsEndImageContext(); 
   theAlert.layer.contents = (id)[theImage CGImage]; 

15.鍵盤透明：

textField.keyboardAppearance = UIKeyboardAppearanceAlert; 

16.狀態(tài)欄的網(wǎng)絡(luò)活動風(fēng)火輪是否旋轉(zhuǎn)：

[UIApplication sharedApplication].networkActivityIndicatorVisible = YES ; //默認(rèn)值是NO。 

//創(chuàng)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(xiàn)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(dāng)前圖形上下文的圖片 
 UIImage *aImage = UIGraphicsGetImageFromCurrentImageContext(); 
  //移除棧頂?shù)幕诋?dāng)前位圖的圖形上下文 
UIGraphicsEndImageContext(); 
//以png格式返回指定圖片的數(shù)據(jù) 
imageData = UIImagePNGRepresentation(aImage); 

18.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; 

19.顯示圖片：

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]; 

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]; 

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]; 

22.鍵盤回收：

-（IBAction）textFieldDoneEditing：（id）sender{ 
      [sender resighFirstRespond]； 
} 

 通過點擊背景回收鍵盤：（兩個都得添加）

-（IBAction）textFieldDoneEditing：（id）sender{ 
　　[sender resighFirstRespond]； 
} 
-（IBAction）backgroundTapped：（id）sender{ 
　　[nameField resignFirstRespond]; 
　　[numberField resignFirstRespond]; 
} 

iOS開發(fā)中一些實用小代碼到這也算是個完結(jié)了，大家可以收集與累積，通過實踐來慢慢掌握這些。