iOS开,发中最有用关键的代码整合

 　　　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._%+-][email protected][A-Za-z0-9.-]+/.[A-Za-z]{2,4}" ;

　　NSPredicate *emailTest = [ NSPredicate predicateWithFormat : @"SELF MATCHES%@" ,emailRegex];

　　return [emailTest evaluateWithObject :email];

　　}

　　　2.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;

　　}

　　　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 : @"rn--%@rn" ,boundary] dataUsingEncoding : NSUTF8StringEncoding ]];

　　[body appendData :[[ NSString stringWithString : @"Content-Disposition:form-data; name="userfile"; filename="2.png"rn" ] dataUsingEncoding : NSUTF8StringEncoding ]]; // 上传上去的图片名字 [body appendData :[[ NSString stringWithString : @"Content-Type: application/octet-streamrnrn" ] dataUsingEncoding : NSUTF8StringEncoding ]];

　　[body appendData :[ NSData dataWithData :imageData]];

　　[body appendData :[[ NSString stringWithFormat : @"rn--%@--rn" ,boundary] dataUsingEncoding : NSUTF8StringEncoding ]];

　　[request setHTTPBody :body];

　　// NSLog(@"1-body:%@",body); NSLog ( @"2-request:%@" ,request);