Question

我的目标是在我的教程中启动应用程序时，为每个UITabBarbuttons显示一个UIPopover ...我正在执行以下操作：

如何从UIView *tabView = [[appDelegate tabBarMutableArray] objectAtIndex:1];中提取帧，这是第一个UITabBarButton。

Array AppDelegate: <UITabBarButton: 0x145d06a70; frame = (254 1; 76 55); opaque = NO; layer = <CALayer: 0x17802c160>>

现在我手动输入254,712,76,55的GCRect。我通过减去768 - 56获得712，并且弹出窗口处于完美位置。但我宁愿通过重新检查值来进行计算......那么如何提取上面结果的frame = (254 1; 76 55)部分呢？

frame = CGRectMake(254,712,76,55);

AppDelegate.h

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

- (NSMutableArray *)tabBarMutableArray;

@end

AppDelegate.m

#import "AppDelegate.h"

@implementation AppDelegate
#define debug 1

- (NSMutableArray *)tabBarMutableArray;
{
    if (debug==1) {
        NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));
    }

    UITabBarController *tabController           = (UITabBarController *)self.window.rootViewController;
    NSMutableArray     *tabBarItemsMutableArray = [NSMutableArray new];

    UITabBar *tabBar = tabController.tabBar;

    for (UIView *view in tabBar.subviews)
    {
        [tabBarItemsMutableArray addObject:view.description];
    }

    return  tabBarItemsMutableArray;
}

viewcontroller.m

-(void)showHomeTabBarPopOver
{
    if (debug==1) {
        NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));
    }

    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    CGRect frame    = CGRectZero;

    NSLog(@"%@", [appDelegate tabBarMutableArray]);

    NSLog(@"Array AppDelegate: %@", [[appDelegate tabBarMutableArray] objectAtIndex:1]);


    UIView *tabView = [[appDelegate tabBarMutableArray] objectAtIndex:1];
    NSLog(@"tabView %@", [tabView valueForKey:@"frame"]);

    //    frame           = tabView.frame;
    NSLog(@"frame %@", CGRectCreateDictionaryRepresentation(self.view.frame));

    frame = CGRectMake(254,712,76,55); //254,712,76,55

    [_getStartedPopover presentPopoverFromRect:frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

}

结果

2014-02-07 14:35:47.940 mCC HD[1964:60b] (
    "<_UITabBarBackgroundView: 0x145d0cb30; frame = (0 0; 1024 56); autoresize = W; userInteractionEnabled = NO; layer = <CALayer: 0x17802db00>>",
    "<UITabBarButton: 0x145d06a70; frame = (254 1; 76 55); opaque = NO; layer = <CALayer: 0x17802c160>>",
    "<UITabBarButton: 0x145e2e360; frame = (364 1; 76 55); opaque = NO; layer = <CALayer: 0x17003c2e0>>",
    "<UITabBarButton: 0x145d0a060; frame = (474 1; 76 55); opaque = NO; layer = <CALayer: 0x17802c6a0>>",
    "<UITabBarButton: 0x145d0a640; frame = (584 1; 76 55); opaque = NO; layer = <CALayer: 0x17802ca20>>",
    "<UITabBarButton: 0x145d0ae60; frame = (694 1; 76 55); opaque = NO; layer = <CALayer: 0x17802cda0>>",
    "<UIImageView: 0x145d0edd0; frame = (0 -0.5; 1024 0.5); autoresize = W; userInteractionEnabled = NO; layer = <CALayer: 0x17802f0a0>>"
)
2014-02-07 14:35:47.940 mCC HD[1964:60b] Running AppDelegate 'tabBarMutableArray'
2014-02-07 14:35:47.941 mCC HD[1964:60b] Array AppDelegate: <UITabBarButton: 0x145d06a70; frame = (254 1; 76 55); opaque = NO; layer = <CALayer: 0x17802c160>>
2014-02-07 14:35:47.943 mCC HD[1964:60b] frame {
    Height = 768;
    Width = 1024;
    X = 0;
    Y = 0;

提前致谢...

-PaulS

Answer 1

修改

（对不起，在我的第一个回答中，我没有看到如何创建tabBarMutableArray。）

在您的AppDelegate中，tabBarItemsMutableArray（这是-tabBarMutableArray方法的返回值）就像这样创建：

for (UIView *view in tabBar.subviews) { [tabBarItemsMutableArray addObject:view.description]; }

因此，该数组中不包含UIView个对象，但NSString个对象（所有子视图的描述）。这就是为什么viewcontroller.m中的以下行不正确并且无法按预期工作的原因：

UIView *tabView = [[appDelegate tabBarMutableArray] objectAtIndex:1];

该行的右侧是NSString，左侧是UIView。

您可以解决此问题，添加行

AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate]; UITabBarController *tabController = (UITabBarController *)appDelegate.window.rootViewController; UITabBar *tabBar = tabController.tabBar; UIView *tabView = [tabBar.subviews objectAtIndex:1]; CGRect frame = tabView.frame

到您的-showHomeTabBarPopOver方法。（虽然有更简洁的方法取决于你想做什么...）

如果您需要所有标签栏项目的框架，而不仅仅是“索引：1”中的特定框架，我建议您在AppDelegate.h中创建一个属性：

@property (strong, nonatomic) NSArray *tabBarViews;

并在AppDelegate.m中实现其getter方法：

- (NSArray *)tabBarViews { UITabBarController *tabController = (UITabBarController *)self.window.rootViewController; UITabBar *tabBar = tabController.tabBar; return tabBar.subviews; }

然后，您可以在viewcontroller.m中更轻松地访问标签栏视图，包括其框架：

AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate]; UIView *tabView0 = [appDelegate.tabBarViews objectAtIndex:0]; CGRect frame0 = tabView0.frame; UIView *tabView1 = [appDelegate.tabBarViews objectAtIndex:1]; CGRect frame1 = tabView1.frame;

等

如何从UITabBarButton中检索CGRect框架？

1 个答案: