自定义Setter用于强，复制，弱和分配原子和非原子？

Question

像这样是非原子的COPY的Setter

@property (copy, nonatomic) NSString *someString;

-(void)setSomeString:(NSString *)someString {
  _someString = someString;
  _someString = [someString copy];
}

像这样我想知道强，弱和分配

的setter和getter

@property (copy, atomic) NSString *someString; // Setter ?
@property (Strong, nonatomic) NSString *someString;
@property (assign, nonatomic) NSString *someString;
@property (Strong, atomic) NSString *someString;
@property (assign, atomic) NSString *someString;

Answer 1

Ex：setter方法

- (void)setImgView:(UIImageView *)imgView{
    if (_imgView == imgView) {
        return;
    }
    _imgView = imgView;
    _imgView.layer.borderColor = [UIColor clearColor].CGColor;
    _imgView.layer.borderWidth = 0.0f;
    _imgView.layer.cornerRadius = _imgView.frame.size.width/2;
}