ios 程式碼片段

//擷取一個視圖的快照- (UIImage *)getImageFromView:(UIView *)view{    float width = [UIScreen mainScreen].bounds.size.width;    float height = [UIScreen mainScreen].bounds.size.height;        UIGraphicsBeginImageContext(CGSizeMake(width, height));    CGContextRef context = UIGraphicsGetCurrentContext();    [view.layer renderInContext:context];        UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return image;}//儲存圖片到相簿- (void)saveImageToAlbum:(UIImage *)image{   UIImageWriteToSavedPhotosAlbum(image, self, nil, nil); }//儲存圖片到本地- (void)saveImageToDisk:(UIImage *)image{    NSString *dir = [NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES) objectAtIndex:0];    NSString *path = [NSString stringWithFormat:@"%@/pic_%f.png",dir,[NSDate timeIntervalSinceReferenceDate]];    NSData *data = [NSData dataWithData:UIImagePNGRepresentation(image)];    [data writeToFile:path atomically:YES];}+ (UIColor *) colorWithHexString: (NSString *) stringToConvert{  NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString]; //去掉前後空格分行符號    // String should be 6 or 8 characters  if ([cString length] < 6) return [UIColor redColor];    // strip 0X if it appears  if ([cString hasPrefix:@"0X"]) cString = [cString substringFromIndex:2];  if ([cString hasPrefix:@"#"]) cString = [cString substringFromIndex:1];  if ([cString length] != 6) return [UIColor redColor];  // Separate into r, g, b substrings  NSRange range;  range.location = 0;  range.length = 2;  NSString *rString = [cString substringWithRange:range];    range.location = 2;  NSString *gString = [cString substringWithRange:range];    range.location = 4;  NSString *bString = [cString substringWithRange:range];    // Scan values  unsigned int r, g, b;  [[NSScanner scannerWithString:rString] scanHexInt:&r];  //掃描16進位到int  [[NSScanner scannerWithString:gString] scanHexInt:&g];  [[NSScanner scannerWithString:bString] scanHexInt:&b];    return [UIColor colorWithRed:((float) r / 255.0f)                         green:((float) g / 255.0f)                          blue:((float) b / 255.0f)                         alpha:1.0f];}