1. ios9以前版本讀取本地HTML的問題
當(dāng)使用loadRequest來讀取本地的HTML時奇昙，WKWebView是無法讀取成功的星持，后臺會出現(xiàn)如下的提示：
Could not create a sandbox extension for /
原因是WKWebView是不允許通過loadRequest的方法來加載本地根目錄的HTML文件。
而在iOS9的SDK中加入了以下方法來加載本地的HTML文件：
[WKWebView loadFileURL:allowingReadAccessToURL:]
但是在iOS9以下的版本是沒提供這個便利的方法的宏胯。以下為解決方案的思路，就是在iOS9以下版本時，先將本地HTML文件的數(shù)據(jù)copy到tmp目錄中谚鄙，然后再使用loadRequest來加載。但是如果在HTML中加入了其他資源文件刁绒，例如js闷营，css，image等必須一同copy到temp中知市。這個是最蛋疼的事情了傻盟。
解決方法如下
1.Objective-C：
//將文件copy到tmp目錄
- (NSURL *)fileURLForBuggyWKWebView8:(NSURL *)fileURL {
NSError *error = nil;
if (!fileURL.fileURL || ![fileURL checkResourceIsReachableAndReturnError:&error]) {
return nil;
}
// Create "/temp/www" directory
NSFileManager *fileManager= [NSFileManager defaultManager];
NSURL *temDirURL = [[NSURL fileURLWithPath:NSTemporaryDirectory()] URLByAppendingPathComponent:@"www"];
[fileManager createDirectoryAtURL:temDirURL withIntermediateDirectories:YES attributes:nil error:&error];
NSURL *dstURL = [temDirURL URLByAppendingPathComponent:fileURL.lastPathComponent];
// Now copy given file to the temp directory
[fileManager removeItemAtURL:dstURL error:&error];
[fileManager copyItemAtURL:fileURL toURL:dstURL error:&error];
// Files in "/temp/www" load flawlesly :)
return dstURL;
}
//調(diào)用邏輯
NSString *path = [[NSBundle mainBundle] pathForResource:@"indexoff" ofType:@"html"];
if(path){
if ([[UIDevice currentDevice].systemVersion floatValue] >= 9.0) {
// iOS9. One year later things are OK.
NSURL *fileURL = [NSURL fileURLWithPath:path];
[self.webView loadFileURL:fileURL allowingReadAccessToURL:fileURL];
} else {
// iOS8. Things can be workaround-ed
// Brave people can do just this
// fileURL = try! pathForBuggyWKWebView8(fileURL)
// webView.loadRequest(NSURLRequest(URL: fileURL))
NSURL *fileURL = [self.fileHelper fileURLForBuggyWKWebView8:[NSURL fileURLWithPath:path]];
NSURLRequest *request = [NSURLRequest requestWithURL:fileURL];
[self.webView loadRequest:request];
}
}
2.Swift
//將文件copy到tmp目錄
func fileURLForBuggyWKWebView8(fileURL: NSURL) throws -> NSURL {
// Some safety checks
var error:NSError? = nil;
if (!fileURL.fileURL || !fileURL.checkResourceIsReachableAndReturnError(&error)) {
throw error ?? NSError(
domain: "BuggyWKWebViewDomain",
code: 1001,
userInfo: [NSLocalizedDescriptionKey: NSLocalizedString("URL must be a file URL.", comment:"")])
}
// Create "/temp/www" directory
let fm = NSFileManager.defaultManager()
let tmpDirURL = NSURL.fileURLWithPath(NSTemporaryDirectory()).URLByAppendingPathComponent("www")
try! fm.createDirectoryAtURL(tmpDirURL, withIntermediateDirectories: true, attributes: nil)
// Now copy given file to the temp directory
let dstURL = tmpDirURL.URLByAppendingPathComponent(fileURL.lastPathComponent!)
let _ = try? fileMgr.removeItemAtURL(dstURL)
try! fm.copyItemAtURL(fileURL, toURL: dstURL)
// Files in "/temp/www" load flawlesly :)
return dstURL
}
//方法調(diào)用
var filePath = NSBundle.mainBundle().pathForResource("file", ofType: "pdf")
if #available(iOS 9.0, *) {
// iOS9. One year later things are OK.
webView.loadFileURL(fileURL, allowingReadAccessToURL: fileURL)
} else {
// iOS8. Things can be workaround-ed
// Brave people can do just this
// fileURL = try! pathForBuggyWKWebView8(fileURL)
// webView.loadRequest(NSURLRequest(URL: fileURL))
do {
fileURL = try fileURLForBuggyWKWebView8(fileURL)
webView.loadRequest(NSURLRequest(URL: fileURL))
} catch let error as NSError {
print("Error: " + error.debugDescription)
}
}
2. WKWebView - WKNavigationDelegate使用
特別提醒一點(diǎn)，在使用以下delegate的方法時
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
需執(zhí)行decisionHandler的block嫂丙。
例如：
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
NSURLRequest *request = navigationAction.request;
WMPageActionType actionType = ActionTypeNone;
WKNavigationActionPolicy actionPolicy = WKNavigationActionPolicyAllow;
if([request.URL.absoluteString hasPrefix:OC_CLOSE_REQUEST]){
actionType = ActionTypeClose;
actionPolicy = WKNavigationActionPolicyCancel;
}
if(self.actionDelegate && [self.actionDelegate respondsToSelector:@selector(webView:action:type:)]) {
[self.actionDelegate webView:webView action:navigationAction type:actionType];
}
//這句是必須加上的娘赴，不然會異常
decisionHandler(actionPolicy);
}
3.WKWebView-JS執(zhí)行方法
WKWebView JS執(zhí)行方法與UIWebView不一樣了。
- (void)evaluateJavaScript:(NSString *)javaScriptString completionHandler:(void (^)(id, NSError *))completionHandler;
completionHandler 擁有兩個參數(shù)奢入，一個是返回錯誤筝闹，一個可以返回執(zhí)行腳本后的返回值
