iOS 一些错误处理

switch语句中 报错
Cannot jump from switch statement to this case label

AB71C361-3D41-4114-9B76-C1E7FCA1AA46.png
解决方法 就是在语句后 加上{}

switch (tag) {
    case 1: { 
        // something to do
        break;
    }
    case 2: {  
        // something to do
        break;
    }
    case 3: {  
        // something to do
        break;
    }
}