点击状态栏，列表滑动到顶部

//XMGTopWindow.m

#import"XMGTopWindow.h"

@implementationXMGTopWindow

staticUIWindow*window_;

+ (void)initialize

{

window_= [[UIWindowalloc]init];

window_.frame=CGRectMake(0,0,XMGScreenW,20);

window_.windowLevel=UIWindowLevelAlert;

[window_addGestureRecognizer:[[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(windowClick)]];

}

+ (void)show

{

window_.hidden=NO;

}

+ (void)hide

{

window_.hidden=YES;

}

/**

*监听窗口点击

*/

+ (void)windowClick

{

UIWindow*window = [UIApplicationsharedApplication].keyWindow;

[selfsearchScrollViewInView:window];

}

+ (void)searchScrollViewInView:(UIView*)superview

{

for(UIScrollView*subviewinsuperview.subviews) {

//如果是scrollview,滚动最顶部

if([subviewisKindOfClass:[UIScrollViewclass]] && subview.isShowingOnKeyWindow) {

CGPointoffset = subview.contentOffset;

offset.y= - subview.contentInset.top;

[subviewsetContentOffset:offsetanimated:YES];

}

//继续查找子控件

[selfsearchScrollViewInView:subview];

}

}

@end

#import"UIView+XMGExtension.h"

@implementationUIView (XMGExtension)

- (BOOL)isShowingOnKeyWindow

{

//主窗口

UIWindow*keyWindow = [UIApplication sharedApplication].keyWindow;

//以主窗口左上角为坐标原点,计算self的矩形框

CGRect newFrame = [keyWindow convertRect:self.frame fromView:self.superview];

CGRect winBounds = keyWindow.bounds;

//主窗口的bounds和self的矩形框是否有重叠

BOOL intersects =CGRectIntersectsRect(newFrame, winBounds);

return!self.isHidden&&self.alpha>0.01&&self.window== keyWindow && intersects;

}

@end