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Cropping Image Programmatically In Xcode

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

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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Restoring inapp purchases in ios

Tuesday, April 2nd, 2013 at 4:07 am

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-(IBAction)inAppRestoreButAxn:(id)sender
 {
    [[SKPaymentQueue defaultQueue] restoreCompletedTransactions];
 }

-(IBAction)inAppRestoreButAxn:(id)sender

{

[[SKPaymentQueue defaultQueue] restoreCompletedTransactions];

}

Adding delay between execution of two lines

Tuesday, April 2nd, 2013 at 4:05 am

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double delayInSeconds = 2.0;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
  NSLog(@"Do some work");
});

double delayInSeconds = 2.0;

dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));

dispatch_after(popTime, dispatch_get_main_queue(), ^(void){

NSLog(@"Do some work");

});

iPhone scroll UITableview by swiping another view

Tuesday, April 2nd, 2013 at 4:04 am

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UISwipeGestureRecognizer * swipegesture = [[UISwipeGestureRecognizer alloc]init];
swipegesture =[myTableview.gestureRecognizers objectAtIndex:1];
[myView addGestureRecognizer:swipegesture];//myView is the another view

UISwipeGestureRecognizer * swipegesture = [[UISwipeGestureRecognizer alloc]init];

swipegesture =[myTableview.gestureRecognizers objectAtIndex:1];

[myView addGestureRecognizer:swipegesture];//myView is the another view

Incoming search terms:

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Autoresize components horizontally in UIScrollView in ios

Tuesday, April 2nd, 2013 at 4:01 am

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//for the scrollview set the below property

[scrollview setAutoresizesSubviews:YES];
//then for every subview of the scrollview set the below property
[subview setAutoresizingMask:UIViewAutoresizingFlexibleWidth];

[scrollview setAutoresizesSubviews:YES];

//then for every subview of the scrollview set the below property

[subview setAutoresizingMask:UIViewAutoresizingFlexibleWidth];

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How to implement transitions between views via a UIPickerView in iOS application

Tuesday, April 2nd, 2013 at 4:00 am

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-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:
(NSInteger)component    
{
    //in this method hide the views that you don't want to show and show the views that you
    don't want to hide, when a particular row is selected.
    NSLog(@"row selected-----&gt;&gt;%d",row);
}

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:

(NSInteger)component

{

//in this method hide the views that you don't want to show and show the views that you

don't want to hide, when a particular row is selected.

NSLog(@"row selected----->>%d",row);

}

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Remainder of float division

Wednesday, March 27th, 2013 at 5:31 am

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Use fmod, to compute the floating point modulus.

float remainder = fmodf(a_float, another_float);

1	float remainder = fmodf(a_float, another_float);

If you want to use double instead of float you’d use fmod instead.

If you want to use long double you’d use fmodl instead.

“Could not change executable permissions on the application.” – Error in Xcode

Thursday, March 21st, 2013 at 7:04 am

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This error occurs when you try to install an app into the device via xcode. This means that there is already an app in the device with the same bundle id, whose executable is mismatching with the new one you are trying to install. To fix this, you have to delete the old app with the same bundle id from the device.

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Fixing Undefined Symbols While Integrating Testflight in IOS

Thursday, March 21st, 2013 at 6:32 am

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The common undefined symbol error appearing while integrating test flight will be something like the following :

Undefined symbols for architecture armv7s:

“_deflateInit_”, referenced from:

_compress_data in libTestFlight.a(tf_compression.o)

“_deflateEnd”, referenced from:

_compress_data in libTestFlight.a(tf_compression.o)

“_deflate”, referenced from:

_compress_data in libTestFlight.a(tf_compression.o)

ld: symbol(s) not found for architecture armv7s

clang: error: linker command failed with exit code 1 (use -v to see invocation)

The fix for this issue is simple.

Goto the build phases of the target for which the issue is appearing. In the link binary with libraries section, use the ‘+’ button at the bottom to add a new library. In the dialog box which appears, search for libz.dylib . You will see the library in the list. Select that and press the ‘Add’ button.

Now perform a build clean for the project and you are done.

Build the app and the issue will be fixed.

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How to change/disable the highlight color of a table cell : Xcode

Wednesday, March 20th, 2013 at 9:51 am

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You can change/disable the highlight color of a table cell using the following codes…

[cell setSelectionStyle:UITableViewCellSelectionStyleBlue];  // set highlighting color = Blue
[cell setSelectionStyle:UITableViewCellSelectionStyleGray];  // set highlighting color = Gray
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];  // Disable highlighting

[cell setSelectionStyle:UITableViewCellSelectionStyleBlue]; // set highlighting color = Blue

[cell setSelectionStyle:UITableViewCellSelectionStyleGray]; // set highlighting color = Gray

[cell setSelectionStyle:UITableViewCellSelectionStyleNone]; // Disable highlighting

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Cropping Image Programmatically In Xcode

Incoming search terms:

Restoring inapp purchases in ios

Adding delay between execution of two lines

iPhone scroll UITableview by swiping another view

Incoming search terms:

Autoresize components horizontally in UIScrollView in ios

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How to implement transitions between views via a UIPickerView in iOS application

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Remainder of float division

“Could not change executable permissions on the application.” – Error in Xcode

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Fixing Undefined Symbols While Integrating Testflight in IOS

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How to change/disable the highlight color of a table cell : Xcode

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