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我將UIGravityBehavior以編程方式添加到子視圖中,但並不總是奏效。我在與標籤101,102,103,104主視圖4次,因爲它顯示的圖像:iOS將UIGravityBehavior添加到子視圖並不總是有效
但似乎只適用於視圖與標籤103和104的某些原因。這裏是我的代碼:
-(void)viewsGoinDown
{
NSPredicate *tagPredicate = [NSPredicate predicateWithFormat:@"self.tag >= 100"];
NSArray *resultArray = [[self.view subviews] filteredArrayUsingPredicate:tagPredicate];
for (NSUInteger i =0 ; i < resultArray.count; i++)
{
NSUInteger sleeping = 2;
UIView *mySubview = resultArray [i];
if (i == 0)
{
sleeping = 0;
}
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
sleep(sleeping);
dispatch_async(dispatch_get_main_queue(), ^()
{
[self moveDownViews:mySubview];
});
});
}
}
-(void)moveDownViews:(UIView*)myView
{
self.animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view];
self.gravityBehavior = [[UIGravityBehavior alloc] initWithItems:@[myView]];
self.gravityBehavior.magnitude = 1;
[self.animator addBehavior:self.gravityBehavior];
}
我的問題是,爲什麼只對那些2子視圖?我做錯了什麼?
我會很感激你的幫助