Common code collation (important)

Common Code collation:

1. Determine if the mailbox format is correct:Using regular expression validation-(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. Image compressionUsage: UIImage *yourimage= [self imagewithimagesimple:image scaledtosize:cgsizemake (210.0, 210.0)];//compress picture-(uiimage*) Imagewithimagesimple: (uiimage*) Image scaledtosize: (cgsize) newsize{//Create a graphic text Uigraphicsbeginimagecontext (newSize  );  Draw the dimensions of the new text//New size[image Drawinrect:cgrectmake (0,0,newsize.width,newsize.height)]; Get a new picture from the text uiimage* newimage = Uigraphicsgetimagefromcurrentimagecontext (); End Edit Text Uigraphicsendimagecontext (); Return the new Image.return NewImage;}3. Pro-Test the available image upload code//Button response event-(Ibaction) Uploadbutton: (ID) Sender {uiimage *image = [uiimage imagenamed:@ "1.jpg"];//Picture name nsdata * ImageData = uiimagejpegrepresentation (image,0.5);//Compression ratio NSLog (@ "number of bytes:%i", [imageData length]);//Post Urlnsstring *urlstring = @ "Http://192.168.1.113:8090/text/UploadServlet";//server address//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]]; Uploaded image name [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-Test output:%@", returnstring); 4. Operations on the gallery Select album: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]; Selection complete:  -(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 the method that you define for yourself, edit the effect you want to achieve after selecting the photo deselect:

-(void) Imagepickercontrollerdidcancel: (uiimagepickercontroller*) Picker

{[Picker dismissmodalviewcontrolleranimated:yes];} 5, create a Uibarbuttonitem right buttonUibarbuttonitem *rightbutton = [[Uibarbuttonitem alloc] initwithtitle:@ "right" Style:uibarbuttonitemstyledone target: Self action: @selector (Clickrightbutton)]; [Self.navigationitem Setrightbarbuttonitem:rightbutton];6, set Navigationbar hideSelf.navigationController.navigationBarHidden = yes;//7,ios Development Uilabel Multi-line text wrapping (auto-fold lines)UIView *footerview = [[UIView alloc]initwithframe:cgrectmake (10, 100, 300, 180)]; UILabel *label = [[UILabel alloc]initwithframe:cgrectmake]];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! "; Auto fold line Setting Label.linebreakmode = Uilinebreakmodewordwrap;label.numberoflines = 0;8, Code generation buttonCGRect frame = CGRectMake (0, 400, 72.0, 37.0); UIButton *button = [UIButton buttonwithtype:uibuttontyperoundedrect];button.frame = frame; [Button settitle:@ "newly added buttons" Forstate:uicontrolstatenormal];button.backgroundcolor = [Uicolor Clearcolor];button.tag = 2000; [Button addtarget:self action: @selector (buttonclicked:) forcontrolevents:uicontroleventtouchupinside]; [Self.view Addsubview:button];9. Make a control appear in the center of the view:(a control, such as Label,view) Label.center = Self.view.center;

10. Good-looking word processing

Take the Textlabel of the cell in TableView as an example: Cell.backgroundcolor = [Uicolorscrollviewtexturedbackgroundcolor];
Set font for text
Cell.textLabel.font = [Uifont fontwithname:@ "Americantypewriter" size:100.0f];
Set the color of text
Cell.textLabel.textColor = [Uicolor Orangecolor];
Set the background color of text
Cell.textLabel.shadowColor = [Uicolor Whitecolor];
Set where text is displayed
Cell.textLabel.textAlignment = Uitextalignmentcenter;

11. Hide Status Bar
The reader may know an easy way to add a viewdidload to the program.

[[UIApplication Sharedapplication]setstatusbarhidden:yes Animated:no];

12. Change the Alertview background

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)];//the size of this place to adjust itself to fit the size of the alertview background color.
Theimage = Uigraphicsgetimagefromcurrentimagecontext ();
Uigraphicsendimagecontext ();
TheAlert.layer.contents = (ID) [Theimage cgimage];

13, keyboard transparent
Textfield.keyboardappearance = Uikeyboardappearancealert;

14, the network activity of the status bar whether the wheel rotates
[UIApplication sharedapplication].networkactivityindicatorvisible, the default value is No.

15. Capture Screen Pictures
Creates a bitmap-based graphics context and specifies a size of Cgsizemake (200,400)
Uigraphicsbeginimagecontext (Cgsizemake (200,400));

Renderincontext renders the recipient and its child scopes to the specified context
[Self.view.layer Renderincontext:uigraphicsgetcurrentcontext ()];
Returns a picture based on the current drawing context
UIImage *aimage = Uigraphicsgetimagefromcurrentimagecontext ();
Removes the top of the stack based on the current bitmap's graphics context
Uigraphicsendimagecontext ();
Returns the data for the specified picture in PNG format
ImageData = Uiimagepngrepresentation (aimage);
16. Change the background of cell selection
UIView *myview = [[UIView alloc] init];
Myview.frame = CGRectMake (0, 0, 320, 47);
Myview.backgroundcolor = [Uicolorcolorwithpatternimage:[uiimage imagenamed:@ "0006.png"];
Cell.selectedbackgroundview = MyView;17. Can make the picture fit the box size (no confirmation)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];

Common code collation (important)