ios截图和合并图片

-(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;
}

- (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;
}

- (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;
}    

将音频、图片转成base64Binary

+(NSData *)base64Encoded:(NSData *)data
{
//base64binary(流媒体)

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];
}


这里调用上面的方法
+(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
}