1、UIView截图

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

CGRect rect = theView.frame;

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

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

}

UIGraphicsBeginImageContext(rect.size);

CGContextRef context = UIGraphicsGetCurrentContext();

[yer renderInContext:context];

UIImage *img = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return img;

}

2、UIScrollview截图

- (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);

[yer renderInContext: UIGraphicsGetCurrentContext()];

image = UIGraphicsGetImageFromCurrentImageContext();

scrollView.contentOffset = savedContentOffset;

scrollView.frame = savedFrame;

}

UIGraphicsEndImageContext();

if (image != nil) {

return image;

}

return nil;

}

3、合并多张图片

- (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、流媒体

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

}