TreePickerView(根据树形数据生成pickerview)

Question

任何深度的树都可生成一个picker，会自动适配picker的列数，算法精简，复杂度极低。
使用方法：

NSString *mainBundleDirectory=[[NSBundle mainBundle] bundlePath];
NSString *path = [mainBundleDirectory stringByAppendingPathComponent:@"ChinaArea.json"];
NSData *data = [[NSData alloc]initWithContentsOfFile:path];
NSError *err;
NSArray *js JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&err;];

XFTreePopupView *treeView = [[XFTreePopupView alloc]initWithDataSource:jsonArray Commit:^(NSArray *ret)
{
NSString *selectedStr = @"";
for (NSDictionary *dict in ret)
{
selectedStr = [selectedStr stringByAppendingString:[dict objectForKey:@"n"]];
}
NSLog(@"%@", selectedStr);
_txt.text = selectedStr;
}];

treeView.isHidden = NO;

树节点必须是(n,i,c)格式，即（节点名称，节点ID，子节点数列）。
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