学步园

1.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:@"SELFMATCHES%@",emailRegex];

 

return [emailTest evaluateWithObject:email];

}

 

2.图片压缩

 

用法：UIImage *yourImage= [self imageWithImageSimple:imagescaledToSize:CGSizeMake(210.0, 210.0)];

//压缩图片

- (UIImage*)imageWithImageSimple:(UIImage*)imagescaledToSize:(CGSize)newSize

{

// Create a graphics image context

UIGraphicsBeginImageContext(newSize);

 

// Tell the old image to draw in this newcontext, with thedesired

// 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.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);

 

 

4.给imageView加载图片

UIImage *myImage =[UIImage imageNamed:@"1.jpg"];

  [imageView setImage:myImage];

  [self.view addSubview:imageView];

 

5.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;

   [selfpresentModalViewController:picker animated:YES];

选择完毕：

 -(void)imagePickerController:(UIImagePickerController*)pickerdidFinishPickingMediaWithInfo:(NSDictionary*)info

{

   [pickerdismissModalViewControllerAnimated:YES];

   UIImage * image=[infoobjectForKey:UIImagePickerControllerEditedImage];

   [selfperformSelector:@selector(selectPic:)withObject:imageafterDelay:0.1];

}

 -(void)selectPic:(UIImage*)image

{

  NSLog(@"image%@",image); 

   imageView = [[UIImageViewalloc] initWithImage:image];

   imageView.frame =CGRectMake(0, 0, image.size.width, image.size.height);

[self.viewaddSubview:imageView];

   [selfperformSelectorInBackground:@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

 

{

   [pickerdismissModalViewControllerAnimated:YES];

}

 

6.跳到下个View

nextWebView =[[WEBViewController alloc] initWithNibName:@"WEBViewController" bundle:nil];

[self presentModalViewController:nextWebView animated:YES];

 

 

 

 

7.创建一个UIBarButton右边按钮

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

[self.navigationItem setRightBarButtonItem:rightButton];

 

 

8.设置navigationBar隐藏

self.navigationController.navigationBarHidden = YES;//

 

9.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;

 

 

10.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];

 

 

11.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；

 

12.自定义text各种效果：

cell.backgroundColor =[UIColorscrollViewTexturedBackgroundColor];

//设置文字的字体

cell.textLabel.font = [UIFontfontWithName:@"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;

 

13.隐藏statusBar：

在程序的viewDidLoad中加入

 

[[UIApplication sharedApplication]setStatusBarHidden:YESanimated: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 = [theImagestretchableImageWithLeftCapWidth:0topCapHeight:0];

   CGSize theSize = [theAlertframe].size;

   UIGraphicsBeginImageContext(theSize);   

   [theImagedrawInRect: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];

 

15.键盘透明：

textField.keyboardAppearance = UIKeyboardAppearanceAlert;


16.状态栏的网络活动风火轮是否旋转：

[UIApplicationsharedApplication].networkActivityIndicatorVisible，默认值是NO。

 

17.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.layerrenderInContext: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);

 

18.更改cell选中的背景：

    UIView*myview = [[UIView alloc] init];

    myview.frame= CGRectMake(0, 0, 320, 47);

   myview.backgroundColor = [UIColorcolorWithPatternImage:[UIImageimageNamed:@"0006.png"]];

   cell.selectedBackgroundView = myview;:

19.显示图片：

CGRect myImageRect = CGRectMake(0.0f, 0.0f, 320.0f,109.0f); 

UIImageView *myImage = [[UIImageView alloc]initWithFrame:myImageRect];

[myImage setImage:[UIImageimageNamed:@"myImage.png"]]; 

myImage.opaque = YES; //opaque是否透明

[self.view addSubview:myImage];

 

20.能让图片适应框的大小（beta）

NSString*imagePath = [[NSBundle mainBundle]pathForResource:@"XcodeCrash"ofType:@"png"];    

    UIImage*image = [[UIImagealloc]initWithContentsOfFile:imagePath];

       UIImage*newImage= [image transformWidth:80.f height:240.f];

    UIImageView*imageView = [[UIImageView alloc]initWithImage:newImage];

        [newImagerelease];

    [imagerelease];

    [self.viewaddSubview:imageView];

 

 

21.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];

 

22.键盘回收：

-（IBAction）textFieldDoneEditing：（id）sender{

[sender resighFirstRespond]；

}

通过点击背景回收键盘：（两个都得添加）