随机颜色,使程序崩溃提醒

// 随机颜色

- (UIColor*)randomColor

{

    CGFloat r = arc4random() % 256 / 255.0;

    CGFloat g = arc4random() % 256 / 255.0;

    CGFloat b = arc4random() % 256 / 255.0;

    return [UIColor colorWithRed:r green:g blue:b alpha:1];

}

调用:[[self randomColor] set];

使程序崩溃提醒

if (!(self.bounds.size.width == self.bounds.size.height)) {

    // 崩溃

    //        [NSException raise:@"回去看看的宽高是不是相等再来用" format:@"宽高不想等"];

    NSException* ex = [NSException exceptionWithName:@"name" reason:@"reason11111" userInfo:nil];

    [ex raise];