Catching NSException in Swift
What I suggest is to make an C function that will catch the exception and return a NSError instead. And then, use this function.
The function could look like this:
NSError *tryCatch(void(^tryBlock)(), NSError *(^convertNSException)(NSException *))
{
NSError *error = nil;
@try {
tryBlock();
}
@catch (NSException *exception) {
error = convertNSException(exception);
}
@finally {
return error;
}
}
And with a little bridging help, you'll just have to call:
if let error = tryCatch(task.launch, myConvertFunction) {
print("An exception happened!", error.localizedDescription)
// Do stuff
}
// Continue task
Note: I didn't really test it, I couldn't find a quick and easy way to have Objective-C and Swift in a Playground.
Here is some code, that converts NSExceptions to Swift 2 errors.
Now you can use
do {
try ObjC.catchException {
/* calls that might throw an NSException */
}
}
catch {
print("An error ocurred: \(error)")
}
ObjC.h:
#import <Foundation/Foundation.h>
@interface ObjC : NSObject
+ (BOOL)catchException:(void(^)(void))tryBlock error:(__autoreleasing NSError **)error;
@end
ObjC.m
#import "ObjC.h"
@implementation ObjC
+ (BOOL)catchException:(void(^)(void))tryBlock error:(__autoreleasing NSError **)error {
@try {
tryBlock();
return YES;
}
@catch (NSException *exception) {
*error = [[NSError alloc] initWithDomain:exception.name code:0 userInfo:exception.userInfo];
return NO;
}
}
@end
Don't forget to add this to your "*-Bridging-Header.h":
#import "ObjC.h"