json字符串里有大括号_统一社会信用代码后面括号

RETURN_VALUE_RECEIVER = {(
    // Do whatever you want
    RETURN_VALUE; // 返回值
)};

self.backgroundView = ({
    UIView *view = [[UIView alloc] initWithFrame:self.view.bounds];
    view.backgroundColor = [UIColor redColor];
    view.alpha = 0.8f;
    view;
});

self.result = ({
    double result = 0;
    for (int i = 0; i <= M_2_PI; i+= M_PI_4) {
        result += sin(i);
    }
    result;
});