如何使用可用于 Swift 类的 std:vector 制作 Objective-c 类 [英] How to make Objective-c class using std:vector made available to Swift classes
问题描述
如果我尝试在我的项目的 Swift 桥接头中包含一个使用 std:vector 的 Objective-C 类,我会在我的类中收到错误:
If I attempt to include an objective-C class that utilizes std:vector in my project's Swift bridging header, in my class I get the error:
#import <vector> Error! 'vector' file not found
有问题的桥接文件在我的自定义框架中.如果我不在桥接标头中包含 Objective-c 标头,则所有编译都可以正常工作,但当然我无法从 Swift 类访问该类.
The bridging file in question is in my custom Framework. If I don't include the objective-c header in my bridging header, all compiles and works fine, but of course I can't access the class from Swift classes.
如何在我的 Swift 类中使用这个 Objective-c 类?
How can I use this objective-c class in my Swift classes?
推荐答案
Swift 仅支持桥接到 目标 C.您需要将任何 CPP 代码/声明移动到 .mm 文件中,例如:
Swift only supports bridging to Objective-C. You need to move any CPP code / declarations to the .mm file, such as:
Foo.h
#import <Foundation/Foundation.h>
@interface Foo : NSObject
- (void)bar;
@end
Foo.mm
#import "Foo.h"
#import <vector>
@interface Foo() {
std::vector<int> _array;
}
@end
@implementation Foo
- (void)bar {
NSLog(@"in bar");
}
@end
<小时>
一种解决方案,如果您必须在其他 C++/Objective-C++ 代码中使用 C++ 类,则为 Swift 的桥接头创建一个单独的头文件,并公开您需要的内容:
One solution, if you have to consume the C++ classes in other C++ / Objective-C++ code, to create a separate header file for Swift's bridging header, and expose what you need:
Foo.h
#import <Foundation/Foundation.h>
#import <vector>
@interface Foo : NSObject {
std::vector<int>* _bar;
}
@property (atomic, readonly) std::vector<int>* bar;
@property (readonly) size_t size;
- (void)pushInt:(int)val;
- (int)popInt;
@end
<小时>
Foo+Swift.h
在你的桥接头中包含这个
Include this in your bridging header
#import <Foundation/Foundation.h>
#import <stdint.h>
@interface Foo : NSObject
@property (readonly) size_t size;
- (void)pushInt:(int)val;
- (int)popInt;
@end
Foo.mm
#import "Foo.h"
@implementation Foo
@synthesize bar;
- (instancetype)init {
if (self = [super init]) {
_bar = new std::vector<int>();
}
return self;
}
- (void)dealloc {
delete _bar;
}
- (void)pushInt:(int)val {
_bar->push_back(val);
}
- (int)popInt {
if (_bar->size() == 0) {
return -1;
}
auto front = _bar->back();
_bar->pop_back();
return front;
}
- (size_t)size {
return _bar->size();
}
@end
main.swift
#import Foundation
let f = Foo()
f.pushInt(5);
f.pushInt(10);
print("size = \(f.size)")
print("\(f.popInt())")
print("\(f.popInt())")
print("size = \(f.size)")
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