ios - 请问为何给属性赋值后，再去调用属性，属性值结果为空？

Question

我在一个类的第一个方法里给属性赋值，如果出了方法，在另外一个方法调用属性，属性值为空。
但如果我在第一个方法里最后直接调用另一个方法，属性值又正常，请问什么原因导致的？

以下代码：

#import "TSNPopView.h"

typedef void(^completion)();
static completion disCom = ^{};

@interface TSNPopView ()
@property (assign,nonatomic) CGPoint disPoint ;
@end

@implementation TSNPopView

- (IBAction)closeView:(UIButton *)sender {
    NSLog(@"%lf", self.disPoint.x);//这里调用的属性的值在自己手动调用时会为空
    [self disappearToPoint: self.disPoint completion:^{
        disCom();
    }];
    
}


-(void)disappearToPoint:(CGPoint)point completion:(void(^)())completion {
    [UIView animateWithDuration:0.5 animations:^{
        self.center = point;
        self.transform = CGAffineTransformMakeScale(0.01, 0.01);
    } completion:^(BOOL finished) {

        [self removeFromSuperview];
                completion();
    }];
}

-(void)showToPoint:(CGPoint)showPoint disappearToPoint:(CGPoint)disPoint completion:(void(^)())completion{
    TSNPopView * popView = [[NSBundle mainBundle] loadNibNamed:@"TSNPopView" owner:nil options:nil][0];
    popView.center =showPoint;
    [[UIApplication sharedApplication].keyWindow addSubview:popView];
     self.disPoint = disPoint; //给属性赋值
    disCom = completion;
    
    //UIButton * btn= [[UIButton alloc] init];
    //[self closeView:btn];//这里主动调用方法  属性就会赋值正常。
   
}
@end

截图：

上面是主动调用的，下面是手动点击按钮调用的

Answer 1

First make sure whether it is with self.disPoint = disPoint;的方法先执行，closeView: and then execute it.

If it still doesn’t work, add KVO and see when the value changes.

Answer 2