[LayaAir 2.0]ios里如何调用js方法

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Menlo; color: #c41a16; background-color: #ffffff}
span.s1 {color: rgba(0, 0, 0, 0.85)}
span.s2 {color: #1c464a}
span.s3 {color: #326d74}
1:  [[conchRuntime GetIOSConchRuntime] runJS:@"window['Platforms'].onFailureVideoFinish()"];
 
2:  [[conchRuntime GetIOSConchRuntime] runJS:@"window.Platforms.onFailureVideoFinish()"];
 
3:  p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Menlo; color: #c41a16; background-color: #ffffff}
span.s1 {color: rgba(0, 0, 0, 0.85)}
span.s2 {color: #1c464a}
span.s3 {color: #326d74}[[conchRuntime GetIOSConchRuntime] runJS:@"Laya.Platforms.onFailureVideoFinish()"];
这三种写法都报错

 
3:  [[conchRuntime GetIOSConchRuntime] runJS:@"com.xxx.xxx.Platforms.onFailureVideoFinish()"];
加包名的写法报错
 
提示找不到“com”