Ios UIWebView背景图像框

这是我的密码

if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
    if ([[UIScreen mainScreen] bounds].size.height == 568) {
        webview.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:@"tripadvisorwaiting5.png"]];
        CGRect frame = webview.frame;
        frame.size.width = 320;
        frame.size.height = 568;
        webview.frame = frame;
    }
    else {
        webview.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:@"tripadvisorwaiting.png"]];
        CGRect frame = webview.frame;
        frame.size.width = 320;
        frame.size.height = 480;
        webview.frame = frame;
    }
}
else {
    webview.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:@"tripadvisorwaitingipad.png"]];
    CGRect frame = webview.frame;
    frame.size.width = 768;
    frame.size.height = 1024;
    webview.frame = frame;
}

但是当页面加载时，图像太大或太小，并且无法根据设备进行缩放。

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你能帮我吗？

我相信

+colorWithPatternImage

会在调用图像时根据帧大小调整图像大小，因此在调用

webview后调整帧大小。backgroundColor=[UIColor WithPatternImage:[UIImage imageNamed:@“tripadvisorwaiting5.png]”对缩放图像没有影响。设置帧大小后，请尝试设置背景图像。例如：

if ([[UIScreen mainScreen] bounds].size.height == 568) {
    CGRect frame = webview.frame;
    frame.size.width = 320;
    frame.size.height = 568;
    webview.frame = frame;

    webview.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:@"tripadvisorwaiting5.png"]];
}