iPhone How-to：如何递归dump UIView
在学习和调试iPhone 界面或者某个控件的过程中，递归地dump出UIView是一个了解界面结构很有效的方法。这样不仅可以更好地发现问题，还可以定制某些系统的标准控件。要解决这类问题，很自然会想到递归函数。实现如下：void dumpViews(UIView* view, NSString *label, NSString *indent){
Class klass = ;
NSString *classDescription = getFullClassDescription(klass);
if ( == NSOrderedSame)
NSLog(@"%@ %@", classDescription, NSStringFromCGRect(view.frame));
else
NSLog(@"%@ %@ %@", label, classDescription, NSStringFromCGRect(view.frame));
for (NSUInteger i = 0; i < ; i++)
{
UIView *subView = ;
NSString *newIndent = [ initWithFormat:@"%@", indent];
NSString *newLabel = [ initWithFormat:@"%@%d:", newIndent, i];
dumpViews(subView, newLabel, newIndent);
;
;
}
}
其中getFullClassDescription是用来获取某个类的继承关系描述：
NSString* getFullClassDescription(Class klass) {
NSString *description = ;
while ()
{
klass = ;
description = ];
}
return description;
}
利用dumpViews对某应用的主窗体进行“偷窥”后输出结果如下：
UIWindow:UIView:UIResponder:NSObject {{0, 0}, {320, 480}}
0: UILayoutContainerView:UIView:UIResponder:NSObject {{0, 0}, {320, 480}}
0: UINavigationTransitionView:UIView:UIResponder:NSObject {{0, 0}, {320, 480}}
1: UINavigationBar:UIView:UIResponder:NSObject {{0, 0}, {320, 44}}
0: UINavigationItemView:UIView:UIResponder:NSObject {{160, 8}, {0, 27}}
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