iOS (Quartz 2D Drawing) Various drawing methods and the use of cameras

One:

Specific use of the details, I also refer to http://blog.163.com/wkyuyang_001/blog/static/10802122820133190545227/

The following describes the use of Quartz 2D drawing to implement the drawing board function

In the. m file, the implementation of the dog is the same as shown in the connection

<pre name= "code" class= "OBJC" > #import "drawTestView.h" #import "Dog.h" @implementation drawtestview@synthesize    dogs,tempdogs;-(nsmutablearray*) dogs{if (dogs = = nil) {dogs = [nsmutablearray array]; } return dogs;}    -(nsmutablearray*) tempdogs{if (tempdogs = = nil) {tempdogs = [Nsmutablearray array]; } return tempdogs;}    -(void) DrawRect: (cgrect) rect{cgcontextref ctx = Uigraphicsgetcurrentcontext ();    Cgcontextsetfillcolorwithcolor (Ctx,[[uicolor Greencolor] cgcolor]); drawing board features [dogs enumerateobjectsusingblock:^ (id obj, Nsuinteger idx, BOOL *stop) {Nsmutablearray*arr = [dogs objec            TATINDEX:IDX];                for (int i = 0; I<[arr count]; i++) {Dog*dog = (dog*) [arr objectatindex:i];                if (i = = 0) {cgcontextmovetopoint (CTX, dog.x, DOG.Y);                }else{Cgcontextaddlinetopoint (CTX, dog.x, DOG.Y);    }        }    }]; [[Uicolor Blackcolor]setstroKE];            Cgcontextdrawpath (CTX, Kcgpathstroke);    }-(void) Touchesbegan: (Nsset *) touches withevent: (uievent *) event{Uitouch*touch = [touches anyobject];    Cgpoint location = [Touch locationinview:self];    Dog*dog = [[Dog alloc]init];    dog.x = location.x;    Dog.y = LOCATION.Y;    [Self.tempdogs Addobject:dog];    [Self.dogs AddObject:self.tempdogs]; [Self setneedsdisplay];//Call draw method}-(void) touchesmoved: (Nsset *) touches withevent: (uievent *) event{Uitouch*tou    CH = [touches anyobject];    Cgpoint location = [Touch locationinview:self];    Dog*dog = [[Dog alloc]init];    dog.x = location.x;    Dog.y = LOCATION.Y;    [Self.tempdogs Addobject:dog];    [Self.dogs addobject:[self.tempdogs Copy]]; [Self setneedsdisplay];//Call draw method}-(void) touchesended: (Nsset *) touches withevent: (uievent *) event{[tempdogs Remov Eallobjects];}

Second: The use of the camera

To implement in the Viewcontroller used

< uinavigationcontrollerdelegate , uiimagepickercontrollerdelegate >//If you write only one uiimagepickercontrollerdelegate, a warning will appear, and you will not even invoke the proxy method

    Imagepicker = [[Uiimagepickercontroller alloc]init];    Imagepicker.delegate = self;

How to get into the camera

-(Ibaction) Goimagepicker: (ID) Sender {        if ([Uiimagepickercontroller issourcetypeavailable: Uiimagepickercontrollersourcetypecamera]) {        Self.imagePicker.sourceType = Uiimagepickercontrollersourcetypecamera;        Self.imagePicker.cameraDevice = uiimagepickercontrollercameradevicefront;//invokes the front-facing header    }else{        Self.imagePicker.sourceType = uiimagepickercontrollersourcetypephotolibrary;    }    self.imagePicker.allowsEditing = YES;    [Self PresentViewController:self.imagePicker animated:yes completion:nil];}

Implement two proxy methods:

-(void) Imagepickercontroller: (Uiimagepickercontroller *) Picker Didfinishpickingmediawithinfo: (NSDictionary *) info {    NSLog (@ "select");    UIImage * image = [info objectforkey:uiimagepickercontrollereditedimage];    _imageselect.frame = CGRectMake (_imageselect.frame.origin.x, _IMAGESELECT.FRAME.ORIGIN.Y, _ ImageSelect.frame.size.width, _imageselect.frame.size.width*image.size.height/image.size.width);//In order not to distort the selected picture    _imageselect.image = image;    [Self.imagepicker Dismissviewcontrolleranimated:yes completion:nil];} -(void) Imagepickercontrollerdidcancel: (Uiimagepickercontroller *) picker{    [Self.imagepicker Dismissviewcontrolleranimated:yes Completion:nil];}

iOS (Quartz 2D Drawing) Various drawing methods and the use of cameras