优化url加载

@@ -45,7 +45,16 @@
 
 
 - (void)setUrl:(NSString *)url
 - (void)setUrl:(NSString *)url
 {
 {
-    _url = url.length>0?[url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]:url;
+    // 检验url是否能正常转成NSURL，防止webview不能加载
+    BOOL isValidUrl = ([NSURL URLWithString:url] != nil);
+    
+    if (url.length > 0
+        && !isValidUrl) {
+        // 如果url里面含有需要转码的字符，则这里进行一次编码
+        _url = [url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
+    } else {
+        _url = url;
+    }
 }
 }
 
 
 - (void)didMoveToSuperview
 - (void)didMoveToSuperview