iphone视图中Y轴相反，如何像Y轴数学一样调整？
我想在iPhone的视图中放置两个点
这是我的代码
UIImageView *center;
center = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"point.png"]];
[center setFrame:CGRectMake(0, 0, 10, 10)];
float r_rect_center_x = [r_img frame].size.width/2;
float r_rect_center_y = [r_img frame].size.height/2;
[center setCenter:CGPointMake(r_rect_center_x,r_rect_center_y)];
[r_img addSubview:center];
[center release];
这是中心，我得到的结果中心点是（X：50，Y：60）
float point1_x = 60.0f;
float point1_y = 60.0f;
UIImageView *point1 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"point.png"]];
[point1 setFrame:CGRectMake(0, 0, 10, 10)];
[point1 setCenter:CGPointMake(point1_x,point1_y)];
[r_img addSubview:point1];
[point1 release];
这是point1，我设置中心是X：60，Y：60
它应该看起来像这样 
但它在模拟器上运行是这样的...... 
如何调整 Y 轴上的 POINT1 中心？？？
非常感谢
韦伯。
I wanna shoe two point in a iphone's view
This is my code
UIImageView *center;
center = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"point.png"]];
[center setFrame:CGRectMake(0, 0, 10, 10)];
float r_rect_center_x = [r_img frame].size.width/2;
float r_rect_center_y = [r_img frame].size.height/2;
[center setCenter:CGPointMake(r_rect_center_x,r_rect_center_y)];
[r_img addSubview:center];
[center release];
This is center, I got result center point is (X:50,Y:60)
float point1_x = 60.0f;
float point1_y = 60.0f;
UIImageView *point1 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"point.png"]];
[point1 setFrame:CGRectMake(0, 0, 10, 10)];
[point1 setCenter:CGPointMake(point1_x,point1_y)];
[r_img addSubview:point1];
[point1 release];
This is point1 , I set the center is X:60,Y:60
It should be looks like this
But it run on the simulator is like this...
HOW TO ADJUST THE POINT1 CENTER IN Y-AXIS ???
Many Thanks
Webber.
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视图上有一个 setFlipped: 方法。只需调用它并传递
YES即可。There's a setFlipped: method on the view. Just call it and pass
YES.