IOS development: How to take screenshots and how to merge multiple images...

How to integrate and multiple images in iOS development...

1. UIView

-(UIImage *) captureView :( UIView *) theView {

CGRect rect = theView. frame;

If ([theView isKindOfClass: [UIScrollView class]) {

Rect. size = (UIScrollView *) theView). contentSize;

}

UIGraphicsBeginImageContext (rect. size );

CGContextRef context = UIGraphicsGetCurrentContext ();

[TheView. layer renderInContext: context];

UIImage * img = UIGraphicsGetImageFromCurrentImageContext ();

UIGraphicsEndImageContext ();

Return img;

}

2. UIScrollview

-(UIImage *) captureScrollView :( UIScrollView *) scrollView {

UIImage * image = nil;

UIGraphicsBeginImageContext (scrollView. contentSize );

{

CGPoint savedContentOffset = scrollView. contentOffset;

CGRect savedFrame = scrollView. frame;

ScrollView. contentOffset = CGPointZero;

ScrollView. frame = CGRectMake (0, 0, scrollView. contentSize. width, scrollView. contentSize. height );

[ScrollView. layer renderInContext: UIGraphicsGetCurrentContext ()];

Image = UIGraphicsGetImageFromCurrentImageContext ();

ScrollView. contentOffset = savedContentOffset;

ScrollView. frame = savedFrame;

}

UIGraphicsEndImageContext ();

If (image! = Nil ){

Return image;

}

Return nil;

}

3. Merge multiple images

-(UIImage *) composeWithHeader :( UIImage *) header content :( UIImage *) content footer :( UIImage *) footer {

CGSize size = CGSizeMake (content. size. width, header. size. height + content. size. height + footer. size. height );

UIGraphicsBeginImageContext (size );

[Header drawInRect: CGRectMake (0,

0,

Header. size. width,

Header. size. height)];

[Content drawInRect: CGRectMake (0,

Header. size. height,

Content. size. width,

Content. size. height)];

[Footer drawInRect: CGRectMake (0,

Header. size. height + content. size. height,

Footer. size. width,

Footer. size. height)];

UIImage * image = UIGraphicsGetImageFromCurrentImageContext ();

UIGraphicsEndImageContext ();

Return image;

}

4. Streaming Media

Convert audio and image to base64Binary

+ (NSData *) base64Encoded :( NSData *) data

{

// Base64binary (Streaming Media)

Static char encodingTable [64] = {

'A', 'B', 'C', 'D', 'E', 'E', 'F', 'G', 'h', 'I', 'J ', 'k', 'l', 'M', 'n', 'O', 'P ',

'Q', 'R', 's', 't', 'U', 'V', 'w', 'x', 'y', 'z ', 'A', 'B', 'C', 'D', 'E', 'E', 'F ',

'G', 'h', 'I', 'J', 'k', 'l', 'M', 'n', 'O', 'P ', 'Q', 'R', 's', 't', 'U', 'V ',

'W', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5 ', '6', '7', '8', '9', '+ ','/'};

Const unsigned char * bytes = [data bytes];

NSMutableString * result = [NSMutableString stringWithCapacity: [data length];

Unsigned long ixtext = 0;

Unsigned long lentext = [data length];

Long ctremaining = 0;

Unsigned char inbuf [3], outbuf [4];

Unsigned short I = 0;

Unsigned short charsonline = 0, ctcopy = 0;

Unsigned long ix = 0;

While (YES)

{

Ctremaining = lentext-ixtext;

If (ctremaining <= 0) break;

For (I = 0; I <3; I ++ ){

Ix = ixtext + I;

If (ix <lentext) inbuf [I] = bytes [ix];

Else inbuf [I] = 0;

}

Outbuf [0] = (inbuf [0] & 0xFC)> 2;

Outbuf [1] = (inbuf [0] & 0x03) <4) | (inbuf [1] & 0xF0)> 4 );

Outbuf [2] = (inbuf [1] & 0x0F) <2) | (inbuf [2] & 0xC0)> 6 );

Outbuf [3] = inbuf [2] & 0x3F;

Ctcopy = 4;

Switch (ctremaining)

{

Case 1:

Ctcopy = 2;

Break;

Case 2:

Ctcopy = 3;

Break;

}

For (I = 0; I <ctcopy; I ++)

[Result appendFormat: @ "% c", encodingTable [outbuf [I];

For (I = ctcopy; I <4; I ++)

[Result appendString: @ "="];

Ixtext + = 3;

Charsonline + = 4;

}

Return [result dataUsingEncoding: NSUTF8StringEncoding];

}

The above method is called here

+ (NSString *) loadingFile :( NSURL *) filepath

{

NSData * data = [[NSData alloc] initWithContentsOfURL: filepath];

NSData * base64Data = [self base64Encoded: data];

NSString * strBase64 = [[NSString alloc] initWithData: base64Data encoding: NSASCIIStringEncoding];

Return strBase64;

// You can upload this base64Data to server now

}