一个半透明的Label 背景透明 文字不透明
AITranslucentLabel *label = [AITranslucentLabel labelWithBuilder:^(AITranslucentLabelBuilder *builder) {
builder.frame = CGRectMake(0, 100, self.view.frame.size.width, 44);
builder.text = @"Xavi";
}];
[self.view addSubview:label];