#import <Foundation/Foundation.h>

@interface Picture : NSObject;

@property (readonly) NSString *filepath;
- (UIImage *)image;

@end

和实施：

#import "Picture.h"

#define kFilepath @"filepath"

@interface Picture () <NSCoding> {
    NSString *filepath;
}

@end


@implementation Picture
@synthesize filepath;

- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    return self;

}

- (void)encodeWithCoder:(NSCoder *)aCoder {
    [aCoder encodeObject:filepath forKey:kFilepath];
}

- (UIImage *)image {
    return [UIImage imageWithContentsOfFile:filepath];
}

@end

我收到错误：ARC问题 – ‘NSObject’没有可见的@interface声明选择器’initWithCoder：’

使用ARC时,NSCoding有什么不同吗？
谢谢

解决方法

- (id)initWithCoder: (NSCoder *)aCoder {
    self = [super init];
    if (self) {
        [aCoder decodeObject: filepath forKey: kFilepath];
    }
    return self;
}

• 上一篇：C堆栈变量是否反向存储？下一篇：objective-c – 如何在Xcode中更改