I've been trying to implement a UIMapView Icon like the one in this picture. Does anybody know how this app is creating that thumbnail?
Edit
Attempting to implement this with the following code:
CLLocationCoordinate2D restaurantLocation = CLLocationCoordinate2DMake(Latitude, Longitude);
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(restaurantLocation, 1000, 1000);
_mapView.region = region;
_mapView.hidden = NO;
_annotation = [[MKPointAnnotation alloc] init];
_annotation.coordinate = restaurantLocation;
//annotation.title = _restaurantInformation
[_mapView addAnnotation:_annotation];
UIGraphicsBeginImageContext(_mapView.frame.size);
[_mapView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *mapImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CGSize newSize;
newSize.width = 50; // any width u want
newSize.height= 80; // any height u want
UIGraphicsBeginImageContext(newSize);
[mapImage drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
_mapThumbnail.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Annotation in Mapview with location should be in centre. Now
UIGraphicsBeginImageContext(mapView.frame.size);
[mapView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *mapImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
For creating thumbnail of mapImage resize according
CGSize newSize;
newSize.width = 50; // any width you want
newSize.height= 80; // any height you want
UIGraphicsBeginImageContext(newSize);
[mapImage drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* thumbnail = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Another Way is
You can try Google Static Maps API
Here's sample code
NSString *urlString = #"http://maps.googleapis.com/maps/api/staticmap?center=Berkeley,CA&zoom=14&size=200x200&sensor=false";
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlString]];
UIImage *thumbnail= [UIImage imageWithData:data];
[yourImageView setImage:thumbnail];
Through this you can get static image based on your coordinates.
This code for showing thumbnail of particular location and its working for me
NSString *staticMapUrl = [NSString stringWithFormat:#"http://maps.google.com/maps/api/staticmap?markers=color:red|%f,%f&%#&sensor=true",lat, log,#"zoom=10&size=114x116"];
NSURL *mapUrl = [NSURL URLWithString:[staticMapUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
UIImage *image = [UIImage imageWithData: [NSData dataWithContentsOfURL:mapUrl]];
[imgViewClue setImage:image];
Related
I want to save image from NSdata after appending additional bytes to the NSMutableData. Below is the sample code for my requirement.
NSData *sourceData = = UIImageJPEGRepresentation([info objectForKey:#"UIImagePickerControllerOriginalImage"], 1);
NSMutableData *concatenatedData = [NSMutableData data];
[concatenatedData appendData:sourceData];
[concatenatedData appendData:sourceData];
UIImage *myFinalImage = [[UIImage alloc] initWithData:concatenatedData];
UIImageWriteToSavedPhotosAlbum(myFinalImage, self, nil, nil);
I am appending the sourcedata 2 times but my final Image is saving with only one sourceData bytes.
Am I missing something here?
Here is the Sample:
CGSize newSize = CGSizeMake({Here give width}, {Here give height});
UIImage *myFinalImage1 = [[UIImage alloc] initWithData:concatenatedData];
UIImage *myFinalImage2 = [[UIImage alloc] initWithData:concatenatedData];
// Set up width height with values.
CGSize newSize = CGSizeMake(width, height);
UIGraphicsBeginImageContext( newSize );
[myFinalImage1 drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
[myFinalImage2 drawInRect:CGRectMake(newSize.width,newSize.height,newSize.width,newSize.height*2) blendMode:kCGBlendModeNormal alpha:1.0];
UIImage *mergedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
I'm trying to save an array of images that I retrieve asynchronously in the cellForRowInIndexPath method of the UITableViewController.
Unfortunately, the array is not fully populated or in incorrect order.
The code within my tableview:cellForRowAtIndexPath method is:
// populate the cell's image
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0);
dispatch_async(queue, ^{
NSURL *url = [NSURL URLWithString:[newsModel url]];
NSData *data = [NSData dataWithContentsOfURL:url];
img = [[UIImage alloc] initWithData:data] ;
[imageArray insertObject:img atIndex:[indexPath row]];
dispatch_sync(dispatch_get_main_queue(), ^{
// make image standard size
CGSize imageSize = CGSizeMake(40, 40);
UIGraphicsBeginImageContext(imageSize);
CGRect imageRect = CGRectMake(0.0, 0.0, imageSize.width, imageSize.height);
[img drawInRect:imageRect];
cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[cell setNeedsLayout];
});
});
Both the imageArray (NSMutableArray) and img (UIImage) are of type __bool.
Thanks in advance for your help.
Try to store into dictionary with key inplace of array because no chances to duplication after that insert into array using AllValue of dictionary
For ex:
imageArray =[[dict allValues]mutableCopy];
NSMutableDictionary *dict=[[NSMutableDictionary alloc]init];
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0);
dispatch_async(queue, ^{
NSURL *url = [NSURL URLWithString:[newsModel url]];
NSData *data = [NSData dataWithContentsOfURL:url];
img = [[UIImage alloc] initWithData:data] ;
[dict setObject:img forKey:indexPath.row]
dispatch_sync(dispatch_get_main_queue(), ^{
// make image standard size
CGSize imageSize = CGSizeMake(40, 40);
UIGraphicsBeginImageContext(imageSize);
CGRect imageRect = CGRectMake(0.0, 0.0, imageSize.width, imageSize.height);
[img drawInRect:imageRect];
cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[cell setNeedsLayout];
});
});
imageArray =[[dict allValues]mutableCopy];
Don't try to modify the cell after the download has completed, you don't know if it's been reused. Just save the image and then ask the table view to reloadData (ensure you ask for the reload on the main thread).
I have implemented coverFlow usinng http://chaosinmotion.com/flowcover.m this link. Its working fine. I want to get coverFlow images through web service. Its working fine for single image. Anyone send me code for getting multiple coverFlow images in a single url having multiple image attributes.Any changes in backend should reflect in code means if no of images are increased then in coverflow also show the same no. of images.
In CoverFlowViewController.h file
NSMutableArray *profilephotos; // declare NSMutableArray
In CoverFlowViewController.m file
- (void)viewDidLoad
{
profilephotos = [[NSMutableArray alloc] initWithObjects:#"www.xxxx.com/ima.jpeg",#"www.xxxx.com/ima1.jpeg",#"www.xxxx.com/ima2.jpeg",#"www.xxxx.com/ima3.jpeg",#"www.xxxx.com/ima4.jpeg",#"www.yyy.com/ima5.jpeg",nil];
NSLog(#"profilephotos = %#",profilephotos); // Your array of Images url
loadImagesOperationQueue = [[NSOperationQueue alloc] init];
for (int i=0; i < [profilephotos count]; i++)
{
NSString *pho = [profilephotos objectAtIndex:i];
NSURL *url = [NSURL URLWithString:pho];
NSData *data = [NSData dataWithContentsOfURL: url];
UIImage *img=[UIImage imageWithData:data];
CGSize newSize = CGSizeMake(300.0f, 300.0f);
UIGraphicsBeginImageContext(newSize);
[img drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[(AFOpenFlowView *)self.view setImage:newImage forIndex:i];
}
[(AFOpenFlowView *)self.view setNumberOfImages:[profilephotos count]];
}
This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
How to release an object declared into a method and passed to another method?
Can you help me fix leaks in this code:
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
UIImage *payload = [[UIImage alloc] initWithData:self.activeDownload];
UIImage *picture = [[UIImage alloc] init];
if (payload.size.width != kAppIconHeight && payload.size.height != kAppIconHeight)
{
CGSize itemSize = CGSizeMake(kAppIconHeight, kAppIconHeight);
UIGraphicsBeginImageContext(itemSize);
CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
[payload drawInRect:imageRect];
picture = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
else
{
picture = payload;
}
self.activeDownload = nil;
[payload release];
self.imageConnection = nil;
[delegate ThumbDidLoad:self.indexPathInTableView Image:[picture autorelease]];
}
Thx for helping,
Stephane
When you set picture = UIGraphicsGetImageFromCurrentImageContext() in your if statement or picture = payload in your else statement, you are loosing the pointer to the previously allocated UIImage you assigned in picture in the first lines, but you never released it.
You shouldn't alloc+init a new UIImage for picture, as you never use it and assign a new value to this variable later... but never used and released the previously allocated one.
UIImage *picture = [[UIImage alloc] init]; and picture = UIGraphicsGetImageFromCurrentImageContext();
You should not initialize picture at the beginning of the code. UIGraphicsGetImageFromCurrentImageContext returns a already initialized UIImage (autoreleased).
UIImage *payload = [[UIImage alloc] initWithData:self.activeDownload];, picture = payload;, [payload release];.
You should use [payload autorelease] instead, otherwise you're releasing the image without ever using it.
[delegate ThumbDidLoad:self.indexPathInTableView Image:[picture autorelease]];
You should remove [picture autorelease] and just use picture.
-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
UIImage *payload = [[UIImage alloc] initWithData:self.activeDownload];
UIImage *picture;
if (payload.size.width != kAppIconHeight && payload.size.height != kAppIconHeight)
{
CGSize itemSize = CGSizeMake(kAppIconHeight, kAppIconHeight);
UIGraphicsBeginImageContext(itemSize);
CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
[payload drawInRect:imageRect];
picture = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
else
{
picture = payload;
}
[payload autorelease];
self.activeDownload = nil;
self.imageConnection = nil;
[delegate ThumbDidLoad:self.indexPathInTableView Image:picture];
}
in my application images are loaded from rss feed in table cell. they are of variant size how can i fix them to certain size. my code is
int blogEntryIndex1 = [indexPath indexAtPosition: [indexPath length] -1];
imgstring=[[blogEntries objectAtIndex: blogEntryIndex1] objectForKey: #"image"];
NSURL *url = [NSURL URLWithString:imgstring];
NSData *data = [NSData dataWithContentsOfURL:url];
UIImage *img = [[UIImage alloc] initWithData:data];
cell.imageView.image=img;
you can view my application screen shot click here
Thanks i will be waiting for your response....
I think I understand what your'e asking...
What you want to do is to resize UIImages.
UIImage* resizeImageToSize(UIImage* image, CGSize size)
{
UIGraphicsBeginImageContext(size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
//Account for flipped coordspace
CGContextTranslateCTM(ctx, 0.0, size.height);
CGContextScaleCTM(ctx, 1.0, -1.0);
CGContextDrawImage(ctx,CGRectMake(0.0f, 0.0f, size.width, size.height), image.CGImage);
UIImage* scaled = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return scaled;
}