NSAlert

1.改大小(x,y动不了，高可以改)
https://www.jianshu.com/p/8ce2a26cca40

2.基本使用

    NSAlert *alert = [[NSAlert alloc] init];
    NSLog(@"frame = %@",NSStringFromRect(alert.window.frame));
    alert.icon = [NSImage imageNamed:@"警告2"];
    [alert addButtonWithTitle:@"确定"];//1000
    [alert addButtonWithTitle:@"取消"];//1001
    [alert setMessageText:@"xxx"];
    [alert setInformativeText:@"xxxxxxxxxxxxxxxxxx"];//英文
    [alert setAlertStyle:NSAlertStyleInformational];
    
    //开始显示告警
    [alert beginSheetModalForWindow:self.window
                  completionHandler:^(NSModalResponse returnCode){
                      //用户点击告警上面的按钮后的回调
                      NSLog(@"returnCode : %ld",(long)returnCode);
                      if ((long)returnCode == 1000) {
                          [self.window orderOut:nil];
                      }
                      
                  }
     ];