iOS开发--OC调用JS篇

https://www.cnblogs.com/gchlcc/p/6154844.html

OC调用JS篇

其中相对应的html部分如下：

<html>

function secondClick() {

share('分享的标题','分享的内容','图片地址');

}

function showAlert(message){

alert(message);

}

</script>

</header>

<body>

<h2> 这里是第二种方式 </h2>

<br/>

<button type="button" onclick="secondClick()">Click Me!</button>

</body>

</html>

方式一

NSString *jsStr = [NSString stringWithFormat:@"showAlert('%@')",@"这里是JS中alert弹出的message"];

[_webView stringByEvaluatingJavaScriptFromString:jsStr];

注意：该方法会同步返回一个字符串，因此是一个同步方法，可能会阻塞UI。

方式二 (推荐这种)

使用JavaScriptCore库来做JS交互。

JSContext *context = [self.webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];

NSString *textJS = @"showAlert('这里是JS中alert弹出的message')";

[context evaluateScript:textJS];

原文链接：http://www.jianshu.com/p/d19689e0ed83

#import <Foundation/Foundation.h>

#import <WebKit/WebKit.h>

@interface WeakScriptMessageDelegate : NSObject<WKScriptMessageHandler>

@property (nonatomic, weak) id<WKScriptMessageHandler> scriptDelegate;

- (instancetype)initWithDelegate:(id<WKScriptMessageHandler>)scriptDelegate;

@end

#import "WeakScriptMessageDelegate.h"

@implementation WeakScriptMessageDelegate

- (instancetype)initWithDelegate:(id<WKScriptMessageHandler>)scriptDelegate

{

self = [super init];

if (self) {

_scriptDelegate = scriptDelegate;

}

return self;

}

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message

{

[self.scriptDelegate userContentController:userContentController didReceiveScriptMessage:message];

}

@end

#import <WebKit/WebKit.h>

#import "WeakScriptMessageDelegate.h"

ClassViewController()

<WKNavigationDelegate, WKScriptMessageHandler>

{

NSURLRequest *request = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:self.url]];

[self.webView loadRequest:request];

// 注册供JS调用的方法

// 返回首页

[self.webView.configuration.userContentController addScriptMessageHandler:[[WeakScriptMessageDelegate alloc] initWithDelegate:self] name:@"leftAction"];

// 上传作品

[self.webView.configuration.userContentController addScriptMessageHandler:[[WeakScriptMessageDelegate alloc] initWithDelegate:self] name:@"uploadPhoto_"];

// 编辑作品

[self.webView.configuration.userContentController addScriptMessageHandler:[[WeakScriptMessageDelegate alloc] initWithDelegate:self] name:@"editPhotoWithWorkId_activityId_"];

//downloadFileWithTitle_size_type_urlStr_

//点击选项

[self.webView.configuration.userContentController addScriptMessageHandler:[[WeakScriptMessageDelegate alloc] initWithDelegate:self] name:@"downloadFileWithTitle_size_type_urlStr_"];

// 他们每到新页面还需要调一下这个方法：setFlagNum(int flag) flag:列表页传1，详情页传2，查看作品传3，评分传4。还需提供三个方法给我们调用：从列表也返回首页javascript:goHome()；从详情页返回到列表页：javascript:goIndex() ；从查看作品页返回到详情页：javascript:goDetailes()

}

#pragma mark - WKNavigationDelegate

- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation

{

[MBProgressHUD hideAllHUDsForView:self.view animated:YES];

if (self.topView.hidden) {

self.topView.hidden = NO;

}

- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error

{

[MBProgressHUD hideAllHUDsForView:self.view animated:YES];

[MBProgressHUD showError:@"网络繁忙，请稍后再试" toView:self.view];

DLog(@"%@", error);

}

#pragma mark - WKScriptMessageHandler

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message

{

// 方法名

NSString *methodName = [message.name stringByReplacingOccurrencesOfString:@"_" withString:@":"];

NSArray *params = message.body;

// 参数（确保传入的是数组）

if ([params isKindOfClass:[NSString class]]) {

params = @[message.body];

}

if ([params isKindOfClass:[NSNull class]]) {

params = nil;

}

[self performSelector:NSSelectorFromString(methodName) withObjects:params];

}

// 上传作品

- (void)uploadPhoto:(NSString *)activityId

{

DLog(@"上传作品")

UIViewController *vc = [[CBUploadExhibitiUIViewControlleronViewController alloc] init];

vc.activityId = [activityId intValue];

vc.delegate = self;

[self.navigationController pushViewController:vc animated:YES];

}

// 编辑作品

- (void)editPhotoWithWorkId:(NSString *)workId activityId:(NSString *)activityId

{

DLog(@"编辑作品")

UIViewController *vc = [[UIViewController alloc] init];

vc.activityId = [activityId intValue];

vc.workId = [workId intValue];

vc.isEditing = YES;

vc.delegate = self;

[self.navigationController pushViewController:vc animated:YES];

}

//点击选项下载

- (void)downloadFileWithTitle:(NSString *)title size:(NSString *)size type:(NSString *)type urlStr:(NSString *)urlStr{

UIViewController *vc = [UIViewController loadFromNib];

vc.title = title;

vc.length = size;

vc.type = type;

vc.fileUrl = urlStr;

[self.navigationController pushViewController:vc animated:YES];

}

#import "NSObject+Extension.h"

@implementation NSObject (Extension)

- (id)performSelector:(SEL)selector withObjects:(NSArray *)objects

{

// 方法签名(方法的描述)

NSMethodSignature *signature = [[self class] instanceMethodSignatureForSelector:selector];

if (signature == nil) {

return nil;

}

// NSInvocation:利用一个NSInvocation对象包装一次方法调用（方法调用者、方法名、方法参数、方法返回值）

NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];

invocation.target = self;

invocation.selector = selector;

if (![objects isKindOfClass:[NSNull class]]) {

// 设置参数

NSInteger paramsCount = signature.numberOfArguments - 2; // 除self、_cmd以外的参数个数

paramsCount = MIN(paramsCount, objects.count);

for (NSInteger i = 0; i < paramsCount; i++) {

id object = objects[i];

if ([object isKindOfClass:[NSNull class]]) continue;

[invocation setArgument:&object atIndex:i + 2];

}

// 调用方法

[invocation invoke];

// 获取返回值

id returnValue = nil;

if (signature.methodReturnLength) { // 有返回值类型，才去获得返回值

[invocation getReturnValue:&returnValue];

}

return returnValue;

}

@end

posted @ 2019-04-03 15:41 sundaysios 阅读(1129) 评论(0) 收藏举报

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iOS开发--OC调用JS篇

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