IOS get pictures and crop from camera or album

Today encountered a user picture upload problem, you need to read from the photo album or camera. The code is simple and extracts the key parts as follows:

Load user image-(void) uesrimageclicked{uiactionsheet *sheet; Determine if the camera is supported if ([Uiimagepickercontroller Issourcetypeavailable:uiimagepickercontrollersourcetypecamera]) {She ET = [[Uiactionsheet alloc] initwithtitle:@ "Select Image" Delegate:self cancelbuttontitle:nil destructivebuttontitle:@ "Cancel"    otherbuttontitles:@ "Photo", @ "select from album", Nil]; } else {sheet = [[Uiactionsheet alloc] initwithtitle:@ "Select Image" Delegate:self cancelbuttontitle:nil destructivebut    tontitle:@ "Cancel" otherbuttontitles:@ "Select from album", Nil];        } Sheet.tag = 255; [Sheet ShowInView:self.view];} #pragma mark-action sheet delegte-(void) Actionsheet: (Uiactionsheet *) Actionsheet Clickedbuttonatindex: (Nsinteger) buttonindex{if (Actionsheet.tag = = 255) {Nsuinteger sourcetype = uiimagepickercontrollersourcetypephotolibrary        ;            Determine if the camera is supported if ([Uiimagepickercontroller Issourcetypeavailable:uiimagepickercontrollersourcetypecamera]) {             Switch (buttonindex) {   Case 0:return;                    Case 1://Camera sourcetype = Uiimagepickercontrollersourcetypecamera;                Break                    Case 2://album sourcetype = Uiimagepickercontrollersourcetypephotolibrary;            Break            }} else {if (Buttonindex = = 0) {return;            } else {sourcetype = Uiimagepickercontrollersourcetypesavedphotosalbum; }}//Jump to camera or album page Uiimagepickercontroller *imagepickercontroller = [[Uiimagepickercontroller alloc] I        NIT];        Imagepickercontroller.delegate = self;        imagepickercontroller.allowsediting = YES;                Imagepickercontroller.sourcetype = sourcetype;    [Self Presentviewcontroller:imagepickercontroller Animated:yes completion:^{}]; }} #pragma mark-image picker delegte-(void) Imagepickercontroller: (Uiimagepickercontroller *) picker DidfinishpickingmediaWithinfo: (nsdictionary *) Info{[picker Dismissviewcontrolleranimated:yes completion:^{}];        UIImage *image = [info uiimagepickercontrolleroriginalimage];        Userimageview.image = image;    NSData *imagedata = uiimagejpegrepresentation (image, Compressed_rate);        UIImage *compressedimage = [UIImage imagewithdata:imagedata];    [Httprequestmanager uploadimage:compressedimage httpClient:self.httpClient delegate:self]; }

Create a form, select a camera or album, and then use the callback function to process the returned picture.

However, the returned image is not a square, showing a noticeable stretch in the view of the user's avatar. Studied for a long time various cutting algorithms, and even want to create a view to deal with. Suddenly found in the code from the camera, album to take pictures of the

Uiimagepickercontrolleroriginalimage

So I followed it in a look:

Uikit_extern NSString *const uiimagepickercontrollermediatype; //An nsstring (UTI, i.e. kuttypeimage)

Uikit_extern NSString *const uiimagepickercontrolleroriginalimage; //A UIImage

Uikit_extern NSString *const uiimagepickercontrollereditedimage; //A UIImage

Uikit_extern NSString *const uiimagepickercontrollercroprect; //An Nsvalue (cgrect)

Uikit_extern NSString *const uiimagepickercontrollermediaurl; //An nsurl

Uikit_extern NSString *const uiimagepickercontrollerreferenceurl ns_available_ios (4_1); //An nsurl-references an

Suddenly, very simple, with uiimagepickercontrollereditedimage, everything is done.

IOS get pictures and crop from camera or album