How to implement loading sign in lightning component salesforce

Component –

<aura:component access="global">
        <ui:spinner aura:id="spinner"/>
        <ui:button press="{!c.toggleSpinner}" label="Toggle Spinner" />
</aura:component>

Controller –

({
    toggleSpinner: function(cmp) {
        var spinner = cmp.find('spinner');
        var evt = spinner.get("e.toggle");
        
	if(!$A.util.hasClass(spinner, 'hideEl')){
	    evt.setParams({ isVisible : false });
	}else {
	    evt.setParams({ isVisible : true });
	}
        evt.fire();
    }
})

Here is the output –

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