使用结构清除绑定

您不必为所有成员创建单独的访问器,只需为您关心的类型创建包装器,例如:

@interface SizeWrapper : NSObject {
    CGFloat width, height;
}    
@property (readwrite) CGFloat width, height;    
- (id)initWithSize:(NSSize)sz;    
- (NSSize)sizeValue;
@end

@implementation SizeWrapper
@synthesize width, height;

- (id)initWithSize:(NSSize)sz {
    if (self = [super init]) {
        width  = sz.width;
        height = sz.height;
    }
    return self;
}

- (NSSize)sizeValue {
    return NSMakeSize(width, height);
}
@end