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(); [theView.layer 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); [scrollView.layer 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}