問題描述：

在IOS中有三個nsmutable數組。要使用printer打印類似下面的數據，怎麼實現？

舉例：

[plain]
0.5    1    10 
 1      10   11 
 2      5    22 
 3      4    6 

0.5    1    10
 1      10   11
 2      5    22
 3      4    6
解決方案：

用UIPrintInteractionController來實現：

具體代碼：

[plain]
NSMutableString *stringToPrint = [[NSMutableString alloc] initWithString:@""]; 
for(int i = 0;i<[array count];i++) 
{ 
    [stringToPrint appendFormat:@"%@",[array objectAtIndex:i]]; 
    if(i%2 == 0) 
    { 
        [stringToPrint appendFormat:@"\n"]; 
    } 
    else 
    { 
         [stringToPrint appendFormat:@"\t"]; 
    } 
} 
UIPrintInteractionController *pic = [UIPrintInteractionController sharedPrintController]; 
 
UIPrintInfo *printInfo = [UIPrintInfo printInfo]; 
printInfo.outputType = UIPrintInfoOutputGeneral; 
printInfo.jobName = @"Midhun"; 
pic.printInfo = printInfo; 
 
UISimpleTextPrintFormatter *textFormatter = [[UISimpleTextPrintFormatter alloc] 
                                             initWithText:stringToPrint]; 
textFormatter.startPage = 0; 
textFormatter.contentInsets = UIEdgeInsetsMake(72.0, 72.0, 72.0, 72.0); // 1 inch margins 
textFormatter.maximumContentWidth = 6 * 72.0; 
pic.printFormatter = textFormatter; 
pic.showsPageRange = YES; 
 
void (^completionHandler)(UIPrintInteractionController *, BOOL, NSError *) = 
^(UIPrintInteractionController *printController, BOOL completed, NSError *error) 
{ 
    if (!completed && error) 
    { 
        NSLog(@"Printing could not complete because of error: %@", error); 
    } 
}; 
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) 
{ 
    [pic presentFromBarButtonItem:sender animated:YES completionHandler:completionHandler]; 
} 
else 
{ 
    [pic presentAnimated:YES completionHandler:completionHandler]; 
} 

NSMutableString *stringToPrint = [[NSMutableString alloc] initWithString:@""];
for(int i = 0;i<[array count];i++)
{
    [stringToPrint appendFormat:@"%@",[array objectAtIndex:i]];
    if(i%2 == 0)
    {
        [stringToPrint appendFormat:@"\n"];
    }
    else
    {
         [stringToPrint appendFormat:@"\t"];
    }
}
UIPrintInteractionController *pic = [UIPrintInteractionController sharedPrintController];

UIPrintInfo *printInfo = [UIPrintInfo printInfo];
printInfo.outputType = UIPrintInfoOutputGeneral;
printInfo.jobName = @"Midhun";
pic.printInfo = printInfo;

UISimpleTextPrintFormatter *textFormatter = [[UISimpleTextPrintFormatter alloc]
                                             initWithText:stringToPrint];
textFormatter.startPage = 0;
textFormatter.contentInsets = UIEdgeInsetsMake(72.0, 72.0, 72.0, 72.0); // 1 inch margins
textFormatter.maximumContentWidth = 6 * 72.0;
pic.printFormatter = textFormatter;
pic.showsPageRange = YES;

void (^completionHandler)(UIPrintInteractionController *, BOOL, NSError *) =
^(UIPrintInteractionController *printController, BOOL completed, NSError *error)
{
    if (!completed && error)
    {
        NSLog(@"Printing could not complete because of error: %@", error);
    }
};
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
{
    [pic presentFromBarButtonItem:sender animated:YES completionHandler:completionHandler];
}
else
{
    [pic presentAnimated:YES completionHandler:completionHandler];
}