cocoa-touch - 如何使用iphone sdk中的手势在框架中移动图像

Question

我是使用手势的新手，通过使用我想在框架中移动图像的手势。任何人都可以帮助解决这个问题。你可以找到下面的图像。

Answer 1

嗨 VSN 首先从您的图像视图中剪切选定的部分

使用此代码

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"tactile_noise.png"]];

    self.imageCropper = [[BJImageCropper alloc] initWithImage:[UIImage imageNamed:@"gavandme.jpg"] andMaxSize:CGSizeMake(1024, 600)];
    [self.view addSubview:self.imageCropper];
    self.imageCropper.center = self.view.center;
    self.imageCropper.imageView.layer.shadowColor = [[UIColor blackColor] CGColor];
    self.imageCropper.imageView.layer.shadowRadius = 3.0f;
    self.imageCropper.imageView.layer.shadowOpacity = 0.8f;
    self.imageCropper.imageView.layer.shadowOffset = CGSizeMake(1, 1);

    [self.imageCropper addObserver:self forKeyPath:@"crop" options:NSKeyValueObservingOptionNew context:nil];

    if (SHOW_PREVIEW) {
        self.preview = [[UIImageView alloc] initWithFrame:CGRectMake(10,10,self.imageCropper.crop.size.width * 0.1, self.imageCropper.crop.size.height * 0.1)];
        self.preview.image = [self.imageCropper getCroppedImage];
        self.preview.clipsToBounds = YES;
        self.preview.layer.borderColor = [[UIColor whiteColor] CGColor];
        self.preview.layer.borderWidth = 2.0;
        [self.view addSubview:self.preview];
    }
}

检查这个例子

https://github.com/barrettj/BJImageCropper/downloads

或 要裁剪选定的图像部分，请这样做

// Create the image from a png file
UIImage *image = [UIImage imageNamed:@"prgBinary.jpg"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];

// Get size of current image
CGSize size = [image size];

// Frame location in view to show original image
[imageView setFrame:CGRectMake(0, 0, size.width, size.height)];
[[self view] addSubview:imageView];
[imageView release];    

// Create rectangle that represents a cropped image  
// from the middle of the existing image
CGRect rect = CGRectMake(size.width / 4, size.height / 4 , 
    (size.width / 2), (size.height / 2));

// Create bitmap image from original image data,
// using rectangle to specify desired crop area
CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], rect);
UIImage *img = [UIImage imageWithCGImage:imageRef]; 
CGImageRelease(imageRef);

// Create and show the new image from bitmap data
imageView = [[UIImageView alloc] initWithImage:img];
[imageView setFrame:CGRectMake(0, 200, (size.width / 2), (size.height / 2))];
[[self view] addSubview:imageView];
[imageView release];

参考这个

http://mobiledevelopertips.com/graphics/how-to-crop-an-image.html

或调整 uiiamgeview 的大小

- (UIImage *)resizeImage:(UIImage*)image newSize:(CGSize)newSize 
{
    CGRect newRect = CGRectIntegral(CGRectMake(0, 0, newSize.width, newSize.height));
    CGImageRef imageRef = image.CGImage;

    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0);
    CGContextRef context = UIGraphicsGetCurrentContext();

    // Set the quality level to use when rescaling
    CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
    CGAffineTransform flipVertical = CGAffineTransformMake(1, 0, 0, -1, 0, newSize.height);

    CGContextConcatCTM(context, flipVertical);  
    // Draw into the context; this scales the image
    CGContextDrawImage(context, newRect, imageRef);

    // Get the resized image from the context and a UIImage
    CGImageRef newImageRef = CGBitmapContextCreateImage(context);
    UIImage *newImage = [UIImage imageWithCGImage:newImageRef];

    CGImageRelease(newImageRef);
    UIGraphicsEndImageContext();    

    return newImage;
}

裁剪或调整图像大小后应用UIPanGestureRecognizer

UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];
    [panRecognizer setMinimumNumberOfTouches:1];
    [panRecognizer setMaximumNumberOfTouches:1];
    [panRecognizer setDelegate:self];
    [holderView addGestureRecognizer:panRecognizer];

-(void)move:(id)sender {

    [[[(UITapGestureRecognizer*)sender view] layer] removeAllAnimations];

    [self.view bringSubviewToFront:[(UIPanGestureRecognizer*)sender view]];
    CGPoint translatedPoint = [(UIPanGestureRecognizer*)sender translationInView:self.view];

    if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan) {

        firstX = [[sender view] center].x;
        firstY = [[sender view] center].y;
    }

    translatedPoint = CGPointMake(firstX+translatedPoint.x, firstY+translatedPoint.y);

    [[sender view] setCenter:translatedPoint];

    if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) {

        CGFloat finalX = translatedPoint.x + (.35*[(UIPanGestureRecognizer*)sender velocityInView:self.view].x);
        CGFloat finalY = translatedPoint.y + (.35*[(UIPanGestureRecognizer*)sender velocityInView:self.view].y);

        if(UIDeviceOrientationIsPortrait([[UIDevice currentDevice] orientation])) {

            if(finalX < 0) {

                finalX = 0;
            }

            else if(finalX > 768) {

                finalX = 768;
            }

            if(finalY < 0) {

                finalY = 0;
            }

            else if(finalY > 1024) {

                finalY = 1024;
            }
        }

        else {

            if(finalX < 0) {

                finalX = 0;
            }

            else if(finalX > 1024) {

                finalX = 768;
            }

            if(finalY < 0) {

                finalY = 0;
            }

            else if(finalY > 768) {

                finalY = 1024;
            }
        }

        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:.35];
        [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
        [[sender view] setCenter:CGPointMake(finalX, finalY)];
        [UIView commitAnimations];
    }
}

Answer 2

//NSURL 连接与 JSON 解析：

https://www.dropbox.com/s/ubmaulkdhbdqha1/ViewController.m

ViewController.h

@interface ViewController : UIViewController<UITableViewDelegate,UITableViewDataSource>
{
    IBOutlet UITableView *tableView1;
    NSArray *practice_ArrayForDisplayingEx;

    NSMutableArray *arrRespone;
    NSMutableData *responseData;


    NSMutableDictionary *resultsDictionary;
    NSURLConnection *urlConnection;


}
@property(nonatomic,strong) IBOutlet UITableView *tableView1;
@property (nonatomic, strong) NSMutableData *responseData;

@end

视图控制器.m

- (void)viewDidLoad
{

    arrRespone=[NSMutableArray new];

    self.responseData = [NSMutableData data];

    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.indiaglitz.com/json/vod_menu_init.asp"]];


    urlConnection=[[NSURLConnection alloc] initWithRequest:request delegate:self];


    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {

    [self.responseData appendData:data];

}



- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{

    [self.responseData setLength:0];

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {

    NSLog(@"didFailWithError");

   // NSLog([NSString stringWithFormat:@"Connection failed: %@", [error description]]);

}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{

    NSLog(@"connectionDidFinishLoading");

    NSLog(@"Succeeded! Received %d bytes of data",[self.responseData length]);

    // convert to JSON

    NSError *myError = nil;

   resultsDictionary = [NSJSONSerialization JSONObjectWithData:self.responseData options:NSJSONReadingMutableLeaves error:&myError];


    NSDictionary  *arrDetails=[[resultsDictionary objectForKey:@"menu"] objectAtIndex:0] ;

    NSDictionary *genr=[[arrDetails valueForKey:@"categories"] objectAtIndex:0];


    NSLog(@"array detailsarray ====>%@",arrDetails);

    NSLog( @"genreee arrray==%@",genr);

    //NSLog(@"genrvalueeee -----%@",[genr valueForKey:@"genre"]);



    NSLog(@"counttttt===%d",[[genr valueForKey:@"genre" ] count]);

    NSLog(@"genre objectatindex==%@",[genr valueForKey:@"cliptype"]);


    for (int i=0;i<[[genr valueForKey:@"genre" ] count];i++)

    {

        NSDictionary *strDetails=[[genr valueForKey:@"genre"] objectAtIndex:i];
        NSString *str=[strDetails valueForKey:@"gname"];
        NSLog(@"First string details===>%@",str);


        [arrRespone addObject:str];

        NSLog(@"response ====>%@",arrRespone);   
    }
    [tableView1 reloadData];
    }
#pragma mark Table view methods

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    NSLog(@"numberOfSectionsInTableView");
    return 1;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    return 45;  
    NSLog(@"heightForRowAtIndexPath");

}
// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    NSLog(@"numberOfRowsInSection");
   return  [arrRespone count];
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    NSLog(@"inside tableview");
    static NSString *CellIdentifier = @"TableCell";

    //TableCell *cell = (TableCell *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {

        cell = [[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier];

    }
   // cell.textLabel.text=[arrRespone objectAtIndex:indexPath.row];

    NSLog(@"cellvalue:%@",cell.textLabel.text);
    NSLog(@"inside numberofRowsInsection");
    // Configure the cell...
      cell.textLabel.text = [arrRespone objectAtIndex:indexPath.row];

    return cell;

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}