Case study of iPhone text page cutting code

The implementation of the iPhone text page-cutting code case is the content to be introduced in this article, mainly to learn how the text is used for page-cutting. This article is mainly based on the Code implementation content to see the specific implementation code.

 
 

  
  
//! If it is not HTML, you can change </p> to n or rn.
  
  
-(NSString *) doPagination :( NSString *) pageContent pageNumber :( NSInteger) number
  
  
FontSize :( NSInteger) size lineHeight :( NSInteger) lheight pageHeight :( NSInteger) pheight
  
  
PageWidth :( NSInteger) pwidth {
  
  
UIFont * tfont = [UIFont fontWithName: @ "Helvetica" size: size];
  
  
CGFloat singleHeight = [@ "medium" sizeWithFont: tfont constrainedToSize: CGSizeMake (float) pwidth, 9999.0)
  
  
LineBreakMode: UILineBreakModeCharacterWrap]. height;
  
  
NSInteger maxline_per_page = (int) (pheight/singleHeight );
  
  
NSArray * paragraphSplit = [pageContent componentsSeparatedByString: @ "</p>"];
  
  
NSString * breakString = @ "nn ";
  
  
NSString * contentTrim;
  
  
NSInteger totalLines = 0;
  
  
NSMutableString * tempString = [NSMutableString string];
  
  
NSString * leftString;
  
  
CGSize csize;
  
  
NSMutableArray * bookPages = [NSMutableArray array];
  
  
For (NSString * para in paragrapheatmap ){
  
  
ContentTrim = [para stringByReplacingOccurrencesOfString: @ "<p>" withString: breakString];
  
  
Csize = [contentTrim sizeWithFont: tfont constrainedToSize: CGSizeMake (float) pwidth, MAXFLOAT)
  
  
LineBreakMode: UILineBreakModeCharacterWrap];
  
  
TotalLines + = (int) (csize. height/singleHeight );
  
  
LeftString = contentTrim;
  
  
If (totalLines> maxline_per_page ){
  
  
TotalLines-= (int) (csize. height/singleHeight );
  
  
For (int I = 0; I <[contentTrim length]; I ++ ){
  
  
NSString * calcString = [contentTrim substringWithRange: NSMakeRange (0, I)];
  
  
Csize = [calcString sizeWithFont: tfont constrainedToSize: CGSizeMake (float) pwidth, MAXFLOAT)
  
  
LineBreakMode: UILineBreakModeCharacterWrap];
  
  
TotalLinestotalLines = totalLines + (int) (csize. height/singleHeight );
  
  
If (totalLines> maxline_per_page)
  
  
{
  
  
I --;
  
  
If ([calcString length]> 0) [tempString appendString: [calcString substringToIndex :( [calcString length]-1)];
  
  
If (I> 0) leftString = [contentTrim substringFromIndex: I]; else leftString = @"";
  
  
[BookPages addObject: [[tempString copy] autorelease];
  
  
TotalLines = (int) ([leftString sizeWithFont: tfont constrainedToSize: CGSizeMake (float) pwidth, MAXFLOAT)
  
  
LineBreakMode: UILineBreakModeCharacterWrap]. height/singleHeight );
  
  
[TempString setString: @ ""];
  
  
Break;
  
  
}
  
  
Else totalLinestotalLines = totalLines-(int) (csize. height/singleHeight );
  
  
}
  
  
}
  
  
[TempString appendString: leftString];
  
  
}
  
  
[BookPages addObject: [[tempString copy] autorelease];
  
  
Self. bookContent = [NSArray arrayWithArray: bookPages];
  
  
Return [bookPages objectAtIndex: number];
  
  
}
 
 

Summary:IPhone textBenPage CuttingThe implementation of the code case is complete. I hope this article will help you.