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Creating a NSDictionary Object With Multiple Objects and Keys

Tuesday, April 30th, 2013 at 10:27 am

NSArray *keyArray; // Key Array

NSArray *objectArray; // Objects Array

keyArray = [NSArray arrayWithObjects:@"key1",@"key2",nil]; // Populating Keys array

objectArray = [NSArray arrayWithObjects:@"object1",@"object2",nil]; // Populating Objects array

NSDictionary *myDictionaryObject = [NSDictionary dictionaryWithObjects: objectArray forKeys: keyArray]; // Creating the dictionary object with objects the corresponding keys.

NSArray *keyArray; // Key Array

NSArray *objectArray; // Objects Array

keyArray = [NSArray arrayWithObjects:@"key1",@"key2",nil]; // Populating Keys array

objectArray = [NSArray arrayWithObjects:@"object1",@"object2",nil]; // Populating Objects array

NSDictionary *myDictionaryObject = [NSDictionary dictionaryWithObjects: objectArray forKeys: keyArray]; // Creating the dictionary object with objects the corresponding keys.

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How to Execute Javascript in UIWebView?

Tuesday, April 30th, 2013 at 10:05 am

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It is possible to execute javascript codes on the webpage loaded in a UIWebView. We can use stringByEvaluatingJavaScriptFromString: method of UIWebView object for this.

This method can be used once the url has been loaded in the web view as follows :

[webViewObj stringByEvaluatingJavaScriptFromString:@"Javascript code to be executed"];  // Here webViewObj is the UIWebView object.

1	[webViewObj stringByEvaluatingJavaScriptFromString:@"Javascript code to be executed"]; // Here webViewObj is the UIWebView object.

Disable glossy effect of the iOS app icon

Monday, April 29th, 2013 at 8:53 am

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The easiest way is to check the Prerendered check box on your target’s Summary tab.

Forcefully set device orientation to landscape left in Xcode

Monday, April 29th, 2013 at 8:43 am

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Add the following macros

#define IOS_OLDER_THAN_6 ( [ [ [ UIDevice currentDevice ] systemVersion ] floatValue ] = 6.0 )

1	#define IOS_OLDER_THAN_6 ( [ [ [ UIDevice currentDevice ] systemVersion ] floatValue ] = 6.0 )

Then add following code to your viewcontroller class’s .m file

#ifdef IOS_OLDER_THAN_6
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{
    return (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft);
}
#endif
#ifdef IOS_NEWER_OR_EQUAL_TO_6
-(BOOL)shouldAutorotate {
    return YES;
}
- (NSUInteger)supportedInterfaceOrientations {
    return UIInterfaceOrientationMaskLandscapeLeft;
}
#endif

#ifdef IOS_OLDER_THAN_6

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{

return (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft);

}

#endif

#ifdef IOS_NEWER_OR_EQUAL_TO_6

-(BOOL)shouldAutorotate {

return YES;

}

- (NSUInteger)supportedInterfaceOrientations {

return UIInterfaceOrientationMaskLandscapeLeft;

}

#endif

How to Enable and Disable Battery Monitoring using Xcode?

Wednesday, April 24th, 2013 at 6:55 am

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We will have to use the batteryMonitoringEnabled property of the device for enabling and disabling battery monitoring using Xcode.

[UIDevice currentDevice].batteryMonitoringEnabled = YES; // This will enable battery monitoring.

[UIDevice currentDevice].batteryMonitoringEnabled = NO; // This will disable battery monitoring.

[UIDevice currentDevice].batteryMonitoringEnabled = YES; // This will enable battery monitoring.

[UIDevice currentDevice].batteryMonitoringEnabled = NO; // This will disable battery monitoring.

Converting Number to Percentage in Xcode

Wednesday, April 24th, 2013 at 6:50 am

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// Setting up the number formatter.
NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init]; // Creating a number formatter object

[numberFormatter setNumberStyle:NSNumberFormatterPercentStyle]; // Setting the number formatter style to make it percent style

[numberFormatter setMaximumFractionDigits:1]; // Setting the maximum fraction for the digit

// Using the number formatter to convert number to percentage

[numberFormatter stringFromNumber:numberValue]; // Using the number formatter object to convert.

// Result

If the value of numberValue is 0.45, then the output will be 45%.

// Setting up the number formatter.

NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init]; // Creating a number formatter object

[numberFormatter setNumberStyle:NSNumberFormatterPercentStyle]; // Setting the number formatter style to make it percent style

[numberFormatter setMaximumFractionDigits:1]; // Setting the maximum fraction for the digit

// Using the number formatter to convert number to percentage

[numberFormatter stringFromNumber:numberValue]; // Using the number formatter object to convert.

// Result

If the value of numberValue is 0.45, then the output will be 45%.

Getting All the JPEG Files in IOS App Bundle Resource Programmatically in Xcode

Friday, April 19th, 2013 at 8:28 am

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NSString *imagePath=[[[NSBundle mainBundle] resourcePath] retain]; // getting the resource path of the app bundle to a string object.

NSFileManager *filemanager=[NSFileManager defaultManager]; // Creating and initializing a NSFileManager object.

NSArray *directoryContents=[filemanager directoryContentsAtPath:imagesPath]; // Getting all the resource files in the app bundle.

NSLog(@"directoryContents = %@",directoryContents); // Now directoryContents array will contain all the resource files that are there in the bundle.

NSMutableArray *jpegFiles = [[NSMutableArray alloc] init]; // Creating a NSMutableArray to store the JPEG files.

for(NSString *fileName in directoryContents) { // Iterating through all the files in the resources

if([[fileName pathExtension] caseInsensitiveCompare:@"jpg"]==NSOrderedSame) { // Checking for path extension "jpg" in the files

[jpegFiles addObject:fileName]; // Storing the files with path extension "jpg" to the array

}

}

NSString *imagePath=[[[NSBundle mainBundle] resourcePath] retain]; // getting the resource path of the app bundle to a string object.

NSFileManager *filemanager=[NSFileManager defaultManager]; // Creating and initializing a NSFileManager object.

NSArray *directoryContents=[filemanager directoryContentsAtPath:imagesPath]; // Getting all the resource files in the app bundle.

NSLog(@"directoryContents = %@",directoryContents); // Now directoryContents array will contain all the resource files that are there in the bundle.

NSMutableArray *jpegFiles = [[NSMutableArray alloc] init]; // Creating a NSMutableArray to store the JPEG files.

for(NSString *fileName in directoryContents) { // Iterating through all the files in the resources

if([[fileName pathExtension] caseInsensitiveCompare:@"jpg"]==NSOrderedSame) { // Checking for path extension "jpg" in the files

[jpegFiles addObject:fileName]; // Storing the files with path extension "jpg" to the array

}

// Now the array, “jpegFiles” will have all the JPEG files in the bundle resources of the app.

Getting All the Files in IOS App Bundle Resource Programmatically in Xcode

Friday, April 19th, 2013 at 8:22 am

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NSString *imagePath=[[[NSBundle mainBundle] resourcePath] retain]; // getting the resource path of the app bundle to a string object.

NSFileManager *filemanager=[NSFileManager defaultManager]; // Creating and initializing a NSFileManager object.

NSArray *directoryContents=[filemanager directoryContentsAtPath:imagesPath]; // Getting all the resource files in the app bundle.

NSLog(@"directoryContents = %@",directoryContents); // Now directoryContents array will contain all the resource files that are there in the bundle.

NSString *imagePath=[[[NSBundle mainBundle] resourcePath] retain]; // getting the resource path of the app bundle to a string object.

NSFileManager *filemanager=[NSFileManager defaultManager]; // Creating and initializing a NSFileManager object.

NSArray *directoryContents=[filemanager directoryContentsAtPath:imagesPath]; // Getting all the resource files in the app bundle.

NSLog(@"directoryContents = %@",directoryContents); // Now directoryContents array will contain all the resource files that are there in the bundle.

Image Tinting Programmatically in Xcode

Friday, April 19th, 2013 at 8:14 am

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// Construct new image the same size as the one passed.

UIImage *image;

UIGraphicsBeginImageContextWithOptions([self size], NO, 0.0); // 0.0 value for scale means "scale for device's main screen".

CGRect rect = CGRectZero;

rect.size = [self size]; // initializing a rect with the size of the original image.

// tint the image

[self drawInRect:rect];

[color set]; // setting the color to be filled as "color", which is a UIColor object to which we are going to tint the image.

UIRectFillUsingBlendMode(rect, kCGBlendModeColor); // Filling the created rect using the blend mode, kCGBlendModeColor

// restore alpha channel

[self drawInRect:rect blendMode:kCGBlendModeDestinationIn alpha:1.0f];

image = UIGraphicsGetImageFromCurrentImageContext(); // image will contain the final tinted image

UIGraphicsEndImageContext();

return image;

UIImage *image;

UIGraphicsBeginImageContextWithOptions([self size], NO, 0.0); // 0.0 value for scale means "scale for device's main screen".

CGRect rect = CGRectZero;

rect.size = [self size]; // initializing a rect with the size of the original image.

// tint the image

[self drawInRect:rect];

[color set]; // setting the color to be filled as "color", which is a UIColor object to which we are going to tint the image.

UIRectFillUsingBlendMode(rect, kCGBlendModeColor); // Filling the created rect using the blend mode, kCGBlendModeColor

// restore alpha channel

[self drawInRect:rect blendMode:kCGBlendModeDestinationIn alpha:1.0f];

image = UIGraphicsGetImageFromCurrentImageContext(); // image will contain the final tinted image

UIGraphicsEndImageContext();

return image;

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Cropping Image Programmatically In Xcode

Friday, April 19th, 2013 at 8:08 am

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The following code will do the trick :

UIImage *image; // Creating the UIImage object

UIGraphicsBeginImageContextWithOptions(destnRect.size, NO, 0.0); // Here destnRect is the desired rectangle for the output image and 0.0 value for scale means "correct scale for device's screen".

CGImageRef sourceImage = CGImageCreateWithImageInRect([self CGImage], sourceRect); // Here sourceRect is the rectangle region for cropping and it happens here.

image = [UIImage imageWithCGImage:sourceImg scale:0.0 orientation:self.imageOrientation]; // creating cropped UIImage.

[image drawInRect:destRect]; // the actual scaling happens here, and orientation is taken care of automatically.

CGImageRelease(sourceImage);

image = UIGraphicsGetImageFromCurrentImageContext(); // Now "image" will contain the final cropped image

UIGraphicsEndImageContext();

UIImage *image; // Creating the UIImage object

UIGraphicsBeginImageContextWithOptions(destnRect.size, NO, 0.0); // Here destnRect is the desired rectangle for the output image and 0.0 value for scale means "correct scale for device's screen".

CGImageRef sourceImage = CGImageCreateWithImageInRect([self CGImage], sourceRect); // Here sourceRect is the rectangle region for cropping and it happens here.

image = [UIImage imageWithCGImage:sourceImg scale:0.0 orientation:self.imageOrientation]; // creating cropped UIImage.

[image drawInRect:destRect]; // the actual scaling happens here, and orientation is taken care of automatically.

CGImageRelease(sourceImage);

image = UIGraphicsGetImageFromCurrentImageContext(); // Now "image" will contain the final cropped image

UIGraphicsEndImageContext();

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Creating a NSDictionary Object With Multiple Objects and Keys

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How to Execute Javascript in UIWebView?

Disable glossy effect of the iOS app icon

Forcefully set device orientation to landscape left in Xcode

How to Enable and Disable Battery Monitoring using Xcode?

Converting Number to Percentage in Xcode

Getting All the JPEG Files in IOS App Bundle Resource Programmatically in Xcode

Getting All the Files in IOS App Bundle Resource Programmatically in Xcode

Image Tinting Programmatically in Xcode

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Cropping Image Programmatically In Xcode

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