@synthesize羽毛= _feathers？

Question

  

可能重复：
  What exactly does @synthesize do?
  Can someone explain this @synthesize syntax?

@interface Duck : NSObject {

    NSArray *_feathers;

}
@property (nonatomic,retain) NSArray *feathers;

@end

@implementation Duck

@synthesize feathers=_feathers;

@end

我想知道你在做@synthesize feat = _feathers时究竟发生了什么？

Answer 1

在你的情况下（因为你的财产是非原子的）

@synthesize feathers=_feathers;

等于

- (void)setFeathers:(NSArray *)newFeathers 
{
    if (newFeathers != _feathers)
    { 
        [_feathers release];
        _feathers = [newFeathers retain];
    }
}

- (NSArray *)feathers
{
    return feathers_;
}