一：

具體使用的細節，本人也是參考www.2cto.com

下面介紹具體使用Quartz 2D繪圖實現畫圖板功能

.m文件中，dog的實現如連接中所示一樣的

 

#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]); //畫圖板功能 [dogs enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop){ NSMutableArray*arr = [dogs objectAtIndex: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];//調用draw方法 } - (void)touchesMoved:(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 copy]]; [self setNeedsDisplay];//調用draw方法 } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{ [tempdogs removeAllObjects]; } 

二：相機的使用

 

要在使用的viewcontroller中實現

//如果只寫一個UIImagePickerControllerDelegate，會出現警告，甚至不會調用代理方法

 

    imagePicker = [[UIImagePickerController alloc]init];
    imagePicker.delegate = self;

 

進入相機的方法

 

 

- (IBAction)goImagePicker:(id)sender {
    
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        self.imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
        self.imagePicker.cameraDevice = UIImagePickerControllerCameraDeviceFront;//調用前置像頭
    }else{
        self.imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    }
    self.imagePicker.allowsEditing = YES;
    [self presentViewController:self.imagePicker animated:YES completion:nil];
}

 

 

實現兩個代理方法：

 

- (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);//為了不讓選出來的圖片變形
    _imageSelect.image = image;
    [self.imagePicker dismissViewControllerAnimated:YES completion:nil];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    [self.imagePicker dismissViewControllerAnimated:YES completion:nil];
}