Added check Type and Refactoring.
Added check Type and Refactoring.

shiratsu/PullToRefreshSwift,dekatotoro/PullToRefreshSwift,MaWenxing/PullToRefreshSwift,csjlengxiang/PullToRefreshSwift,dekatotoro/PullToRefreshSwift,shiratsu/PullToRefreshSwift,csjlengxiang/PullToRefreshSwift,tasanobu/PullToRefreshSwift,tasanobu/PullToRefreshSwift,MaWenxing/PullToRefreshSwift