How to load images using SDWebImage library - ios

Question

Hi I am using SDWebImage for loading images ok that's fine
Here I am getting images from services and I want to resize those images and I want to load them using SDWebImage
for this I wrote the code below
Obj.imageYH---> this is imageURL
NSData *imageData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:Obj.imageYH]];
UIImage *actualImage = [UIImage imageWithData:imageData];
UIGraphicsBeginImageContext(CGSizeMake(150, 150));
[actualImage drawInRect:CGRectMake(0,0,150, 150)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *smallData = UIImagePNGRepresentation(newImage);
NSString *Finalstring = [[NSString alloc] initWithData:smallData encoding:NSUTF8StringEncoding] ;
[Mainimage sd_setImageWithURL:[NSURL URLWithString: Finalstring] placeholderImage:[UIImage imageNamed:#"collectionViewIcon.png"]];
but in the code above, I am getting null value in Finalstring. How can I resize it and how can I load images using SDWebImage?

Answer 1

Step 1: Installation of SDWebImage
To start with, make sure you're using the latest version of SDWebImage, and installed via CocoaPods (not recommend to link up the library manually).
Your Podfile should contain this line:
pod 'SDWebImage', '~>3.7'
After that, close the Xcode project and run pod install in your project directory. Use the Xcode workspace after installation.
Step 2: Using the codes
First of all, you have the import the library
#import <SDWebImage/UIImageView+WebCache.h>
At this moment, try to Clean & Build the Workspace. If everything goes well, the project should be built without error.
Then, in your function:
SDWebImageManager *manager = [SDWebImageManager sharedManager];
[manager downloadImageWithURL:Obj.imageYH
options:0
progress:^(NSInteger receivedSize, NSInteger expectedSize) {
// progression tracking code, optional.
// You can set the progress block to nil
}
completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
if (image) {
// Resize your image here, then set it to UIImageView
Mainimage.image = [UIImage imageWithData:UIImagePNGRepresentation(image) scale:0.5f];
// resize to 0.5x, function available since iOS 6
}
}];
done.

Answer 2

Use below line of codes instead of your code :
UIImage *actualImage = [UIImage imageWithData:imageData];
UIGraphicsBeginImageContext(CGSizeMake(150, 150));
[actualImage drawInRect:CGRectMake(0,0,150, 150)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *smallData = UIImagePNGRepresentation(newImage);
[smallData writeToFile:Finalstring atomically:YES];// Finalstring is file path of resize image
[Mainimage sd_setImageWithURL:[NSURL URLWithString: Finalstring] placeholderImage:[UIImage imageNamed:#"collectionViewIcon.png"]];

Answer 3

SDWebImageManager *manager = [SDWebImageManager sharedManager];
[manager downloadWithURL:url delegate:self options:0 success:^(UIImage
*image) {
cell.profilePicture.image = [self imageByScalingAndCroppingForSize:CGSizeMake(cell.profilePicture.frame.size.width,
cell.profilePicture.frame.size.height) image:image]; } failure:nil];
Don't forget to include
#import <SDWebImage/UIImageView+WebCache.h>
#interface YourViewController : UIViewController <SDWebImageManagerDelegate>