Finished implementation for header/footer for iOS

src/ios/APPPrinterRenderer.m

@@ -23,6 +23,12 @@
 #include "APPPrinterRenderer.h"
 #include "APPPrinterUnit.h"
 
+@interface APPPrinterRenderer ()
+
+@property (nonatomic, retain) NSDictionary *settings;
+
+@end
+
 @implementation APPPrinterRenderer
 
 #pragma mark -
@@ -48,51 +54,178 @@
     if (header)
     {
         dots = [APPPrinterUnit convert:header[@"unit"]];
-        self.headerHeight = dots * [header[@"height"] doubleValue];
+        self.headerHeight = dots * [header[@"height"] floatValue];
     }
 
     if (footer)
     {
-        dots = [APPPrinterUnit convert:header[@"unit"]];
-        self.footerHeight = dots * [footer[@"height"] doubleValue];
+        dots = [APPPrinterUnit convert:footer[@"unit"]];
+        self.footerHeight = dots * [footer[@"height"] floatValue];
     }
 
+    _settings = spec;
+
     return self;
 }
 
 #pragma mark -
-#pragma mark Private
+#pragma mark Callbacks
 
 - (void) drawHeaderForPageAtIndex:(NSInteger)index inRect:(CGRect)rect
 {
-    NSString *header = [NSString stringWithFormat:@"Sample header at page %ld", index + 1];
-    NSMutableParagraphStyle *style = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
-
-    style.alignment = NSTextAlignmentRight;
-
-    UIFont *font = [UIFont fontWithName:@"Courier" size:UIFont.labelFontSize];
-
-    NSDictionary *attrs = @{ NSFontAttributeName: font,
-                                  NSParagraphStyleAttributeName: style,
-                                  NSForegroundColorAttributeName: [UIColor redColor]};
-
-    [header drawInRect:rect withAttributes:attrs];
+    [self drawLabelsFromDictionary:_settings[@"header"]
+                    forPageAtIndex:index
+                            inRect:rect];
 }
 
 - (void) drawFooterForPageAtIndex:(NSInteger)index inRect:(CGRect)rect
 {
-    NSString *footer = @"Sample Footer";
-    NSMutableParagraphStyle *style = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
+    [self drawLabelsFromDictionary:_settings[@"footer"]
+                    forPageAtIndex:index
+                            inRect:rect];
+}
 
+#pragma mark -
+#pragma mark Private
+
+- (void) drawLabelsFromDictionary:(NSDictionary *)spec
+                   forPageAtIndex:(NSInteger)index
+                           inRect:(CGRect)rect
+{
+    NSDictionary* label  = spec[@"label"];
+    NSArray *labels = label ? @[label] : spec[@"labels"];
+
+    if (!labels)
+    {
+        NSString *text = spec[@"text"];
+
+        if (![self strIsNullOrEmpty:text])
+        {
+            labels = @[@{ @"text":text }];
+        }
+    }
+
+    if (!labels) return;
+
+    for (label in labels) {
+        [self drawLabelFromDictionary:label forPageAtIndex:index inRect:rect];
+    }
+}
+
+- (void) drawLabelFromDictionary:(NSDictionary *)spec
+                  forPageAtIndex:(NSInteger)index
+                          inRect:(CGRect)rect
+{
+    NSString *label = spec[@"text"];
+    NSString *align = spec[@"align"];
+    BOOL showIndex  = [spec[@"showPageIndex"] boolValue];
+
+    if (showIndex)
+    {
+        label = [self strIsNullOrEmpty:label] ? @"%ld" : label;
+        label = [NSString stringWithFormat:label, index + 1];
+    }
+
+    if ([self strIsNullOrEmpty:label])
+        return;
+
+    NSMutableParagraphStyle *style = [[NSParagraphStyle defaultParagraphStyle]
+                                      mutableCopy];
+
+    if ([align isEqualToString:@"left"])
+    {
+        style.alignment = NSTextAlignmentLeft;
+    }
+    else if ([align isEqualToString:@"right"])
+    {
+        style.alignment = NSTextAlignmentRight;
+    }
+    else if ([align isEqualToString:@"center"])
+    {
         style.alignment = NSTextAlignmentCenter;
+    }
+    else if ([align isEqualToString:@"justified"])
+    {
+        style.alignment = NSTextAlignmentJustified;
+    }
 
-    UIFont *font = [UIFont fontWithName:@"Helvetica" size:UIFont.buttonFontSize];
+    NSString *hex  = spec[@"color"];
+    UIColor *color;
+
+    if ([self strIsNullOrEmpty:hex])
+    {
+        color = UIColor.darkTextColor;
+    }
+    else
+    {
+        if ([hex characterAtIndex:0] == '#')
+        {
+            hex = [hex substringFromIndex:1];
+        }
+
+        color = [self colorFromHexString:hex];
+    }
+
+    if (!color)
+    {
+        color = UIColor.darkTextColor;
+    }
+
+    double size = [spec[@"size"] doubleValue];
+
+    if (size <= 0.0)
+    {
+        size = UIFont.smallSystemFontSize;
+    }
+
+    UIFont *font = [UIFont fontWithName:spec[@"font"] size:size];
+
+    if (!font)
+    {
+        font = [UIFont systemFontOfSize:size];
+    }
+
+    UIFontDescriptorSymbolicTraits traits = 0;
+
+    if ([spec[@"bold"] boolValue])
+    {
+        traits = traits | UIFontDescriptorTraitBold;
+    }
+
+    if ([spec[@"italic"] boolValue])
+    {
+        traits = traits | UIFontDescriptorTraitItalic;
+    }
+
+    font = [UIFont fontWithDescriptor:[font.fontDescriptor fontDescriptorWithSymbolicTraits:traits]
+                                 size:size];
 
     NSDictionary *attrs = @{ NSFontAttributeName: font,
                              NSParagraphStyleAttributeName: style,
-                             NSForegroundColorAttributeName: [UIColor blueColor]};
+                             NSForegroundColorAttributeName: color };
 
-    [footer drawInRect:rect withAttributes:attrs];
+    [label drawInRect:rect withAttributes:attrs];
+}
+
+- (BOOL) strIsNullOrEmpty:(NSString *)string
+{
+    return [string isEqual:[NSNull null]] || string.length == 0;
+}
+
+- (UIColor *)colorFromHexString:(NSString *)hex
+{
+    unsigned rgb = 0;
+
+    NSScanner *scanner = [NSScanner scannerWithString:hex];
+
+    [scanner setCharactersToBeSkipped:
+     [NSCharacterSet characterSetWithCharactersInString:@"#"]];
+
+    [scanner scanHexInt:&rgb];
+
+    return [UIColor colorWithRed:((rgb & 0xFF0000) >> 16)/255.0
+                           green:((rgb & 0xFF00) >> 8)/255.0
+                            blue:(rgb & 0xFF)/255.0 alpha:1.0];
 }
 
 @end

www/printer.js

@@ -57,12 +57,18 @@ exports.getDefaults = function () {
 
         header: {
             unit: 'cm',
-            height: 0,
-        },
+            height: 1,
 
-        footer: {
-            unit: 'cm',
-            height: 0
+            labels: [{
+                text: 'Awesome Printer Plug-in',
+                align: 'center',
+                italic: true,
+                color: '#FF0000'
+            },{
+                showPageIndex: true,
+                align: 'right',
+                bold: true
+            }]
         }
     };
 };