How iOS develops screenshots and how to merge multiple pictures ...

1, UIView screenshot

-(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 screenshot

-(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. Combine multiple photos

-(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

Turn audio and pictures into base64binary

+ (NSData *) base64encoded: (NSData *) data

{

base64binary (Streaming media)

static char encodingtable[64] = {

' A ', ' B ', ' C ', ' D ', ' 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 ', ' 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];

}

This calls the above method

+ (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;

Can upload this base64data to server now

}