<div class="init-loading">
    <div class="loader"></div>
</div>

var loading = View.find(‘.init-loading‘);
loading.setAttribute(‘class‘, ‘hide‘);

@keyframes before {
    0% {
        width: 0.5em;
        box-shadow: 1em -0.5em rgba(225, 20, 98, 0.75), -1em 0.5em rgba(111, 202, 220, 0.75);
    }
    35% {
        width: 2.5em;
        box-shadow: 0 -0.5em rgba(225, 20, 98, 0.75), 0 0.5em rgba(111, 202, 220, 0.75);
    }
    70% {
        width: 0.5em;
        box-shadow: -1em -0.5em rgba(225, 20, 98, 0.75), 1em 0.5em rgba(111, 202, 220, 0.75);
    }
    100% {
        box-shadow: 1em -0.5em rgba(225, 20, 98, 0.75), -1em 0.5em rgba(111, 202, 220, 0.75);
    }
}
@keyframes after {
    0% {
        height: 0.5em;
        box-shadow: 0.5em 1em rgba(61, 184, 143, 0.75), -0.5em -1em rgba(233, 169, 32, 0.75);
    }
    35% {
        height: 2.5em;
        box-shadow: 0.5em 0 rgba(61, 184, 143, 0.75), -0.5em 0 rgba(233, 169, 32, 0.75);
    }
    70% {
        height: 0.5em;
        box-shadow: 0.5em -1em rgba(61, 184, 143, 0.75), -0.5em 1em rgba(233, 169, 32, 0.75);
    }
    100% {
        box-shadow: 0.5em 1em rgba(61, 184, 143, 0.75), -0.5em -1em rgba(233, 169, 32, 0.75);
    }
}
.loader {
    position: absolute;
    top: calc(50% - 1.25em);
    left: calc(50% - 1.25em);
    width: 2.5em;
    height: 2.5em;
    transform: rotate(165deg);
}
.loader:before, .loader:after {
    content: ‘‘;
    position: absolute;
    top: 50%;
    left: 50%;
    display: block;
    width: 0.5em;
    height: 0.5em;
    border-radius: 0.25em;
    transform: translate(-50%, -50%);
}
.loader:before {
    animation: before 2s infinite;
}
.loader:after {
    animation: after 2s infinite;
}

.init-loading{
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: 99999;
    background: #eee;
}
.init-loading.hide {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s;
}