iOS - UIView 类目关于 frame 的封装

以下是demo截图:

UIView+ZJJFrameView.m 方法：

#pragma mark - 视图底部

- (void)setBottom:(float)bottom {

    CGRect rect = self.frame;

    rect.origin.y = bottom - rect.size.height;

    self.frame = rect;

}

- (float)bottom {

    return self.frame.origin.y+self.frame.size.height;

}

#pragma mark - 视图上部

- (void)setTop:(float)top {

    CGRect rect = self.frame;

    rect.origin.y = top;

    self.frame = rect;

}

- (float)top {

    return self.frame.origin.y;

}

#pragma mark - 视图左面

- (void)setLeft:(float)left {

    CGRect rect = self.frame;

    rect.origin.x = left;

    self.frame = rect;

}

- (float)left {

    return self.frame.origin.x;

}

#pragma mark - 视图右面

- (void)setRight:(float)right {

    CGRect rect = self.frame;

    rect.origin.x = right - rect.size.width;

    self.frame = rect;

}

- (float)right {

    return self.frame.origin.x + self.frame.size.width;

}