iOS开发之弹出窗口实例

思路是这个对话窗口，其实也是一个ViewController, 假设是ModalViewController
代码如下

// 判断系统版本

#define iOSVersionGreaterThanOrEqualTo(v)     ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)

 

//  按钮触发事件

- (void)buttonPressed:(id)sender

    ModalViewController *modalVC = [[ModalViewController alloc] init];

    modalVC.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;

    if ( iOSVersionGreaterThanOrEqualTo(@"8.0") ) {

        modalVC.providesPresentationContextTransitionStyle = YES;

        modalVC.definesPresentationContext = YES;

        modalVC.modalPresentationStyle = UIModalPresentationOverCurrentContext;

        [self presentViewController:modalVC animated:YES completion:nil];

    } else {

        self.view.window.rootViewController.modalPresentationStyle = UIModalPresentationCurrentContext;

        [self presentViewController:modalVC animated:NO completion:nil];

        self.view.window.rootViewController.modalPresentationStyle = UIModalPresentationFullScreen;

    }

}