0716UIWebViewJS转OC离线断点
1、OC调用JS
主要方法就是- (nullable NSString *)stringByEvaluatingJavaScriptFromString:(NSString *)script;
2、JS调用OC
先在JS中写上
<script>
function login()
{
// 让webView跳转到百度页面（加载百度页面）
location.href = 'xmg://openCamera';
}
</script>
再在OC中的webView的代理方法中
/**
* 通过这个方法完成JS调用OC
* JS和OC交互的第三方框架：WebViewJavaScriptBridge
*/
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
NSString *url = request.URL.absoluteString;
NSString *scheme = @"xmg://";
if ([url hasPrefix:scheme]) {
NSString *methodName = [url substringFromIndex:scheme.length];
[self performSelector:NSSelectorFromString(methodName) withObject:nil];
return NO;
}
NSLog(@"想加载其他请求，不是想调用OC的方法");
return YES;
}
3、Xcode中强制忽略警告（07-js调用oc03-2个参数）
// 去除Xcode编译警告
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
//这里写要忽略的代码，"-Warc-performSelector-leaks"是忽略类型
#pragma clang diagnostic pop
4、利用NSInvocation实现performSelector无限参数（08-js调用oc04-多个参数）
5、关于拦截异常，崩溃统计和闪退处理（09-异常处理-11-程序闪退处理）
拦截异常有两种
//用关键字抛
@throw [NSException exceptionWithName:@"haha" reason:@"数组越界" userInfo:nil];
//直接抛
[NSException raise:@"haha" format:@"数组越界"];
@try {
@autoreleasepool {
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
}
} @catch (NSException *exception) {
NSLog(@"main------%@", [exception callStackSymbols]);
}
崩溃统计实现的思路是在崩溃的时刻记录到沙盒里，然后下次启动程序的时候发送到服务器
void handleException(NSException *exception)
{
NSMutableDictionary *info = [NSMutableDictionary dictionary];
info[@"callStack"] = [exception callStackSymbols]; // 调用栈信息（错误来源于哪个方法）
info[@"name"] = [exception name]; // 异常名字
info[@"reason"] = [exception reason]; // 异常描述（报错理由）
// [info writeToFile:<#(NSString *)#> atomically:<#(BOOL)#>];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
// 将沙盒中的错误信息传递给服务器
// 设置捕捉异常的回调
NSSetUncaughtExceptionHandler(handleException);
return YES;
}
闪退处理：闪退前可以提示用户要闪退了，让用户知道操作了哪一步导致闪退，虽然闪退是种很差的用户体验，但是尽量还是不要规避闪退
void handleException(NSException *exception)
{
[[UIApplication sharedApplication].delegate performSelector:@selector(handle)];
}
- (void)handle
{
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"哈哈" message:@"傻逼了把" delegate:self cancelButtonTitle:@"好的" otherButtonTitles:nil, nil];
[alertView show];
// 重新启动RunLoop
[[NSRunLoop currentRunLoop] addPort:[NSPort port] forMode:NSDefaultRunLoopMode];
[[NSRunLoop currentRunLoop] run];
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSLog(@"-------点击了好的");
exit(0);
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// 设置捕捉异常的回调
NSSetUncaughtExceptionHandler(handleException);
return YES;
}
6、断点下载（这个功能AFN并没有实现，AFN的上传不错）
// 所需要下载的文件的URL
#define XMGFileURL @"http://120.25.226.186:32812/resources/videos/minion_01.mp4"
// 文件名（沙盒中的文件名）
#define XMGFilename XMGFileURL.md5String
// 文件的存放路径（caches）
#define XMGFileFullpath [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:XMGFilename]
// 存储文件总长度的文件路径（caches）
#define XMGTotalLengthFullpath [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"totalLength.xmg"]
// 文件的已下载长度
#define XMGDownloadLength [[[NSFileManager defaultManager] attributesOfItemAtPath:XMGFileFullpath error:nil][NSFileSize] integerValue]
#import "ViewController.h"
#import "NSString+Hash.h"
#import "UIImageView+WebCache.h"
@interface ViewController () <NSURLSessionDataDelegate>
/** 下载任务 */
@property (nonatomic, strong) NSURLSessionDataTask *task;
/** session */
@property (nonatomic, strong) NSURLSession *session;
/** 写文件的流对象 */
@property (nonatomic, strong) NSOutputStream *stream;
/** 文件的总长度 */
@property (nonatomic, assign) NSInteger totalLength;
@end
@implementation ViewController
- (NSURLSession *)session
{
if (!_session) {
_session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc] init]];
}
return _session;
}
- (NSOutputStream *)stream
{
if (!_stream) {
_stream = [NSOutputStream outputStreamToFileAtPath:XMGFileFullpath append:YES];
}
return _stream;
}
- (NSURLSessionDataTask *)task
{
if (!_task) {
NSInteger totalLength = [[NSDictionary dictionaryWithContentsOfFile:XMGTotalLengthFullpath][XMGFilename] integerValue];
if (totalLength && XMGDownloadLength == totalLength) {
NSLog(@"----文件已经下载过了");
return nil;
}
// 创建请求
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://120.25.226.186:32812/resources/videos/minion_01.mp4"]];
// 设置请求头
// Range : bytes=xxx-xxx
NSString *range = [NSString stringWithFormat:@"bytes=%zd-", XMGDownloadLength];
[request setValue:range forHTTPHeaderField:@"Range"];
// 创建一个Data任务
_task = [self.session dataTaskWithRequest:request];
}
return _task;
}
- (void)viewDidLoad
{
[super viewDidLoad];
NSLog(@"%@", XMGFileFullpath);
}
/**
* 开始下载
*/
- (IBAction)start:(id)sender {
// 启动任务
[self.task resume];
}
/**
* 暂停下载
*/
- (IBAction)pause:(id)sender {
[self.task suspend];
}
#pragma mark - <NSURLSessionDataDelegate>
/**
* 1.接收到响应
*/
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSHTTPURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler
{
// 打开流
[self.stream open];
// 获得服务器这次请求 返回数据的总长度
self.totalLength = [response.allHeaderFields[@"Content-Length"] integerValue] + XMGDownloadLength;
// 存储总长度
NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithContentsOfFile:XMGTotalLengthFullpath];
if (dict == nil) dict = [NSMutableDictionary dictionary];
dict[XMGFilename] = @(self.totalLength);
[dict writeToFile:XMGTotalLengthFullpath atomically:YES];
// 接收这个请求，允许接收服务器的数据
completionHandler(NSURLSessionResponseAllow);
}
/**
* 2.接收到服务器返回的数据（这个方法可能会被调用N次）
*/
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data
{
// 写入数据
[self.stream write:data.bytes maxLength:data.length];
// 下载进度
NSLog(@"%f", 1.0 * XMGDownloadLength / self.totalLength);
}
/**
* 3.请求完毕（成功\失败）
*/
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error
{
// 关闭流
[self.stream close];
self.stream = nil;
// 清除任务
self.task = nil;
}
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