Question

我意识到for循环被旧系统弃用了，但是还没弄清楚问题是什么..我已经在目标c中创建了for循环现在我想知道这是否与引入xCode 7.3方式实现for循环是否已弃用。如果答案是你可以给我一个关于如何不弃用的循环的例子？但我无法理解我的错误在哪里

for (NSInteger i = 0; i < self.valueForBar.count; i++ ) {


        // Creazione delle barre in movimento

        CGFloat columnWidth = 25;
        CGFloat maximumValueOfBar = self.frame.size.height;
        CGFloat index = [[self.valueForBar objectAtIndex:i] floatValue] /100;
        CGFloat barWidth = 20;

        UIBezierPath *path = [UIBezierPath bezierPath];
        [path moveToPoint:CGPointMake(15 +columnWidth *i,maximumValueOfBar -25)];
        [path addLineToPoint:CGPointMake(15 +columnWidth *i,(maximumValueOfBar -25) - maximumValueOfBar * index)];


        CAShapeLayer *pathLayer = [CAShapeLayer layer];
        pathLayer.frame = self.scrollChart.bounds;
        pathLayer.path = path.CGPath;
        pathLayer.strokeColor = self.fillBarColor.CGColor;
        pathLayer.fillColor = nil;
        pathLayer.lineWidth = barWidth;
        pathLayer.lineJoin = kCALineJoinBevel;


        [self.scrollChart.layer addSublayer:pathLayer];


        CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
        pathAnimation.duration = 1;
        pathAnimation.fromValue = [NSNumber numberWithFloat:0.0f];
        pathAnimation.toValue = [NSNumber numberWithFloat:1.0f];
        [pathLayer addAnimation:pathAnimation forKey:@"strokeEnd"];

    }

Answer 1

循环的C样式在Swift中不推荐使用，而不是在Objective C中。目标C是C的超级集合并且符合C标准，因此循环的C样式永远不会消失，特别是因为Apple不发布这些天很多目标C发生了变化。

For循环在xCode 7.3上弃用

1 个答案: