Objective-C

Iterate over Direct Child Nodes by Index

See more XML Examples

Demonstrates some ways to iterate over direct child nodes by index.

The input XML, available at http://www.chilkatsoft.com/data/get_child.xml, is this:

<root>
    <fruit color="red">apple</fruit>
    <fruit color="green">pear</fruit>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <fruit color="purple">grape</fruit>
    <cheese color="yellow">cheddar</cheese>
</root>

Objective-C

#import <CkoXml.h>

BOOL success = NO;

CkoXml *xml = [[CkoXml alloc] init];
CkoXml *child = 0;

// The sample input XML is available at http://www.chilkatsoft.com/data/get_child.xml
success = [xml LoadXmlFile: @"get_child.xml"];
if (success != YES) {
    NSLog(@"%@",xml.LastErrorText);
    return;
}

// The NumChildren property contains the number of direct
// child nodes.  Note: The child nodes under "xyz" are NOT
// direct children of "root".  Therefore, the "root" node has
// 7 direct children
NSLog(@"%@%d",@"NumChildren = ",[xml.NumChildren intValue]);

// Iterate over the direct children by index. The first child
// is at index 0.
int i;
for (i = 0; i <= [xml.NumChildren intValue] - 1; i++) {
    //  access the tag and content directly by index:
    NSLog(@"%d%@%@%@%@",i,@": ",[xml GetChildTagByIndex: [NSNumber numberWithInt: i]],@" : ",[xml GetChildContentByIndex: [NSNumber numberWithInt: i]]);

}

NSLog(@"%@",@"-----");

// Do the same as the above loop, but get the child node
// and access the Tag and Content properties:
for (i = 0; i <= [xml.NumChildren intValue] - 1; i++) {
    child = [xml GetChild: [NSNumber numberWithInt: i]];
    NSLog(@"%d%@%@%@%@",i,@": ",child.Tag,@" : ",child.Content);

}

NSLog(@"%@",@"-----");

// Do the same as the above loop, but instead of creating
// a new object instance for each child, call GetChild2 to
// update the object's reference instead.
for (i = 0; i <= [xml.NumChildren intValue] - 1; i++) {
    // Navigate to the Nth child.  
    success = [xml GetChild2: [NSNumber numberWithInt: i]];
    NSLog(@"%d%@%@%@%@",i,@": ",xml.Tag,@" : ",xml.Content);
    // Navigate back up to the parent:
    success = [xml GetParent2];
}

NSLog(@"%@",@"-----");

// Notice that the Content of the "xyz" node is empty.  This is correct.
// The "xyz" node has no Content, but 2 direct children