iOS中捕获日志与异常示例详解

意思就是需要一个 返回 void 并且参数为 NSException *exception 的函数指针。

你想要，那我就给你！

所以下面有个 C 语言的函数，你看这个写法和 OC 的声明也不一样。

void UncaughtExceptionHandler(NSException* exception)
{
NSString* name = [ exception name ];
NSString* reason = [ exception reason ];
NSArray* symbols = [ exception callStackSymbols ]; // 异常发生时的调用栈
NSMutableString* strSymbols = [ [ NSMutableString alloc ] init ]; //将调用栈拼成输出日志的字符串
for ( NSString* item in symbols )
{
[ strSymbols appendString: item ];
[ strSymbols appendString: @"rn" ];
}

//将crash日志保存到Document目录下的Log文件夹下
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *logDirectory = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Log"];

NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:logDirectory]) {
[fileManager createDirectoryAtPath:logDirectory withIntermediateDirectories:YES attributes:nil error:nil];
}

NSString *logFilePath = [logDirectory stringByAppendingPathComponent:@"UncaughtException.log"];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"]];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSString *dateStr = [formatter stringFromDate:[NSDate date]];

NSString *crashString = [NSString stringWithFormat:@"<- %@ ->[ Uncaught Exception ]rnName: %@, Reason: %@rn[ Fe Symbols Start ]rn%@[ Fe Symbols End ]rnrn", dateStr, name, reason, strSymbols];
//把错误日志写到文件中
if (![fileManager fileExistsAtPath:logFilePath]) {
[crashString writeToFile:logFilePath atomically:YES encoding:NSUTF8StringEncoding error:nil];
}else{
NSFileHandle *outFile = [NSFileHandle fileHandleForWritingAtPath:logFilePath];
[outFile seekToEndOfFile];
[outFile writeData:[crashString dataUsingEncoding:NSUTF8StringEncoding]];
[outFile closeFile];
}

//把错误日志发送到邮箱
// NSString *urlStr = [NSString stringWithFormat:@"mailto://XXXXX@126.com?subject=bug报告&body=感谢您的配合!<br><br><br>错误详情:<br>%@",crashString ];
// NSURL *url = [NSURL URLWithString:[urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
// [[UIApplication sharedApplication] openURL:url];
}