我使用以下代码生成 pdf 文件及其内容。最初,我设计了 pdf 内容,通过将 cgpoint 值赋予线条来绘制表格。
+(void)drawPDF:(NSString*)fileName
{
UIGraphicsBeginPDFContextToFile(fileName, CGRectZero, nil);
UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 1024, 748), nil);
int xOrigin = 50;
int yOrigin = 300;
int rowHeight = 120;
int columnWidth = 130;
int numberOfRows = 7;
int numberOfColumns = 4;
[self drawTableAt:CGPointMake(xOrigin, yOrigin) withRowHeight:rowHeight andColumnWidth:columnWidth andRowCount:numberOfRows andColumnCount:numberOfColumns];
UIGraphicsEndPDFContext();
}
+(void)drawTableAt:(CGPoint)origin
withRowHeight:(int)rowHeight
andColumnWidth:(int)columnWidth
andRowCount:(int)numberOfRows
andColumnCount:(int)numberOfColumns
{
for (int i = 0; i <= numberOfRows; i++) {
int newOrigin = origin.y + (rowHeight*i);
CGPoint from = CGPointMake(origin.x, newOrigin);
CGPoint to = CGPointMake(origin.x + (numberOfColumns*columnWidth), newOrigin);
[self drawLineFromPoint:from toPoint:to];
}
for (int i = 0; i <= numberOfColumns; i++) {
int newOrigin = origin.x + (columnWidth*i);
CGPoint from = CGPointMake(newOrigin, origin.y);
CGPoint to = CGPointMake(newOrigin, origin.y +(numberOfRows*rowHeight));
[self drawLineFromPoint:from toPoint:to];
}
}
+(void)drawLineFromPoint:(CGPoint)from toPoint:(CGPoint)to
{
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(context, 2.0);
CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();
CGFloat components[] = {0.2, 0.2, 0.2, 0.3};
CGColorRef color = CGColorCreate(colorspace, components);
CGContextSetStrokeColorWithColor(context, color);
CGContextMoveToPoint(context, from.x, from.y);
CGContextAddLineToPoint(context, to.x, to.y);
CGContextStrokePath(context);
CGColorSpaceRelease(colorspace);
CGColorRelease(color);
}
输出为
但我将 numberOfRows 指定为 7,只有 3 行可见,查看其余行(即)我需要查看 pdf 的第二页。numberOfRows 可能会动态变化,如果 numberOfRows = 12 表示否。pdf 中的页数应为 3 或以上。该怎么办?我是新手。