在 UIView 中绘制或移动物体的最佳实践
对于 iPhone 的 Objective-C 新手，我正在做一些实验。
在我让两个方块在屏幕上移动的情况下，我尝试了两种方法，但似乎没有任何区别。但我想可能是图形更重。
两种方法都在计时器上更新：
[NSTimer scheduledTimerWithTimeInterval:1.0/60.0 target:self selector:@selector(update) userInfo:nil repeats:YES];
1- 移动
我尝试的第一种方法是在更新方法中移动方形 UIView 的中心点：
mySquare.center = CGPointMake(mySquare.center.x+0.5, mySquare.center.y+0.5);
2- 绘图
第二种方法是更改方形 UIView 的框架属性并在中重绘视图更新方法：
[mySquare update:CGRectMake(mySquare.frame.origin.x+0.5, mySquare.frame.origin.y+0.5, mySquare.frame.size.width, mySquare.frame.size.height)];
Square UIView中的更新方法：
[self setFrame:rect];
[self setNeedsDisplay];
所以，在移动和绘制之间。
使用 Objective-C 推动事情发展的最佳方式是什么？ 什么会带来最好的性能？ 最好的做法是什么？
谢谢罗穆
New to Objective-C for iPhone, I'm making some experiment.
In a case where I make 2 squares moving on the screen, I've tried two methods where it doesn't seem to make any difference. But I guess it might be with heavier graphics.
Both Methods are updated on a timer:
[NSTimer scheduledTimerWithTimeInterval:1.0/60.0 target:self selector:@selector(update) userInfo:nil repeats:YES];
1- moving
The first method I tried is moving the center point of the square UIView in an update method:
mySquare.center = CGPointMake(mySquare.center.x+0.5, mySquare.center.y+0.5);
2- drawing
The second method is changing the frame property of the square UIView and redraw the view in an update method:
[mySquare update:CGRectMake(mySquare.frame.origin.x+0.5, mySquare.frame.origin.y+0.5, mySquare.frame.size.width, mySquare.frame.size.height)];
In the Square UIView update method:
[self setFrame:rect];
[self setNeedsDisplay];
So, between moving and drawing.
What would be the best to make things moving with Objective-C?
What will give the best performance?
What would be the best practice?
Thanks
Romu
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正确的方法是使用 Core Animation。查看 MoveMe 示例应用程序。
The right way to do this is to use Core Animation. Take a look at the MoveMe sample application.