参考：
https://stackoverflow.com/questions/32758811/catching-nsexception-in-swift
https://github.com/jonbrooks/ObjCTryCatch/blob/master/ObjCTryCatch/ObjCTryCatch.m
#import <UIKit/UIKit.h>
//! Project version number for ObjCTryCatch.
FOUNDATION_EXPORT double ObjCTryCatchVersionNumber;
//! Project version string for ObjCTryCatch.
FOUNDATION_EXPORT const unsigned char ObjCTryCatchVersionString[];
@interface ObjCTry <__covariant T>: NSObject
/**
* wraps `block` in an Objective C try block, catching any exceptions
* and returning them in the user info of the returned error. This will
* import into swift as a throwing function that throws the error.
*/
+ (BOOL)doTry:(void(^)())block error:(NSError **)err;
/**
* Same as above, but used for blocks that produce an Objective C object.
*/
+ (T)doTryObj:(T(^)())block error:(NSError **)err;
@end
#import <Foundation/Foundation.h>
#import "ObjCTryCatch.h"
@implementation ObjCTry
+ (BOOL)doTry:(void(^)())block error:(NSError **)err {
@try {
block();
return YES;
}
@catch (NSException *exception) {
*err = [NSError errorWithDomain:@"todo" code:1 userInfo:@{@"exception": exception}];
}
return NO;
}
+ (id)doTryObj:(id(^)())block error:(NSError **)err {
@try {
return block();
}
@catch (NSException *exception) {
*err = [NSError errorWithDomain:@"todo" code:1 userInfo:@{@"exception": exception}];
}
return nil;
}
@end
