Skip to main content
search
All Posts By

admin

Jul 24
Love0

UIImageView retina

By Blog

When setting up an image to the UIImageView for dbl resolution for retina display make sure to set the image after setting the frame of the view as initWithImage on UIImageView does not work properly.

 

1
2

UIImageView *backgroundImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
[backgroundImageView setImage:[UIImage imageNamed:@"bg-wall01.jpg"]];

 

Where in resources we have file named “bg-wall01@2x.jpg”, iOS4 does the trick for us to set the image scale to 2.0 for us (or rather 0.5 in fact).

Happy coding!

 

Jul 24
Love0

Objective C – datetime current

By Blog

No more need to explain. How to get the current datetime and have it stored.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
 
// get time and rotate minute arrow and hour arrow
// get current time
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
 
//  get the current hour & min
[dateFormatter setDateFormat:@"HHmm"];
NSDate *today = [NSDate date];
NSString *str = [dateFormatter stringFromDate:today];
NSString *strHour = [str substringToIndex:2];
NSString *strMin = [str substringFromIndex:2];
 
// convert hour and minute to the integer values so we can use it
NSInteger hour = [strHour integerValue];
NSInteger minute = [strMin integerValue];
 

 

Jul 24
Love0

UIImage ScaleToFit

By Blog

Sometimes the image provided by the UIImagePicker is not the right size, and putting it to the UIImageView is not enough as we do need to know the size it was being fit to.

 

Let’s cut the chase, here is the code:

 

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
 
public static class UIImageUtils
	{
		/// 
		/// 
		/// 
		/// 
		/// A 
		/// 
		public static UIImage ScaleToFit(UIImage sourceImage, System.Drawing.SizeF targetSize)
		{
			UIImage newImage;
 
			SizeF imageSize = sourceImage.Size;
			float width = imageSize.Width;
			float height = imageSize.Height;
 
			float targetWidth = targetSize.Width;
			float targetHeight = targetSize.Height;
 
			float scaleFactor = 0f;
			float scaledWidth = targetWidth;
			float scaledHeight = targetHeight;
 
			PointF thumbnailPoint = new PointF(0, 0);
 
			if (imageSize != targetSize)
			{
				float widthFactor = targetWidth / width;
        			float heightFactor = targetHeight / height;
 
				if (widthFactor < heightFactor) 
                		scaleFactor = widthFactor;
        			else
                		scaleFactor = heightFactor;
 
				scaledWidth = width * scaleFactor;
        			scaledHeight = height * scaleFactor;
 
				// center the image
 
        			if (widthFactor < heightFactor) 
				{
                		thumbnailPoint.Y = (targetHeight - scaledHeight) * 0.5f; 
        			} 
				else if (widthFactor > heightFactor) 
				{
                		thumbnailPoint.X = (targetWidth - scaledWidth) * 0.5f;
        			}
			}
 
			RectangleF thumbnailRect = new RectangleF(new PointF(0, 0), new SizeF(scaledWidth, scaledHeight));
 
			UIGraphics.BeginImageContext(thumbnailRect.Size);
 
			sourceImage.Draw(thumbnailRect);
 
			newImage = UIGraphics.GetImageFromCurrentImageContext();
			UIGraphics.EndImageContext();
 
			return newImage;
		}
	}

Hope this helps.

Happy coding!

Jul 24
Love0

Tap gesture without UITapGestureRecognizer

By Blog

Ever needed to handle the tap event but needed to distinguish between tap and double tap? I guess everybody sometimes get to such issue and surprisingly prior iOS 4 there is no simple way how to do it.

With iOS4 you just call UITapGestureRecognizer and you are ready to go, so how to do it with version prior iOS4? Here you go:

 

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
	NSUInteger numTaps = [[touches anyObject] tapCount];
 
	if (numTaps < 2) 
	{
		[self performSelector:@selector(doSomeSingleTapAction) withObject:nil afterDelay: 0.25];
 
		[self.nextResponder touchesEnded:touches withEvent:event];
	} 
     	else 
     	{
		if(numTaps == 2) 
          	{
			[NSObject cancelPreviousPerformRequestsWithTarget:self];
 
			[self performSelector:@selector(doSomeDblTapAction) withObject:nil afterDelay: 0.25];
		}		
 
	}
}

 

Happy coding!

 

Jun 09
Love0

Security

By portfolio
Coming form the banking industry background we are familiar with all the necesities modern solution needs in terms of platform setup, robustness, scalability.
Read More
Close Menu