ios - 让 UIView 响应快速、快速的单击的最佳方法是什么？

Question

我有一个观点，希望用户能够快速切换。我尝试过使用 UITapGestureRecognizer，但它并没有像我想要的那样很好地拾取水龙头。我还应该尝试其他方法吗？

谢谢!

Answer 1

您可以创建自己的 UIView 派生类，并将其作为您正在使用的任何 View 的 subview 插入，以直接获取“触摸”输入。我将它用作屏幕上的覆盖层，以便我可以触发屏幕更改、动画、“我已经看完了”输入机制等。

此方法使用UIView 的touchesEnded 覆盖(参见代码)，而不是UITapGestureRecognizer。这是“老派”objective-C，不使用 ARC。

这是头文件“TapView.h”

#import <UIKit/UIKit.h>


@interface TapView : UIView 
{
    SEL touchedCallback;
    id touchedCallbackTarget;
   UILabel* label;
}

@property(nonatomic,assign) SEL touchedCallback;
@property(nonatomic,retain) id touchedCallbackTarget;
@property(nonatomic,retain) UILabel* label;

-(void)respondToTap:(SEL)withCallback andTarget:(id)target;

@end

您创建该类并调用 [tapView respondToTap....] 以使用您的目标对其进行初始化。像这样的东西(在 viewDidLoad 中):

- (void)viewDidLoad
{
   [super viewDidLoad];
   UIView* navView = [ViewUtilities SetNavigationTitle:@"Thing Tank" andSubtitle:@"Tap Here To Empty Tank" forView:self];
   CGRect frame = navView.frame;   
   CGRect tapFrame = CGRectMake(0, 0, frame.size.width, frame.size.height);
   TapView* tapView = [[[TapView alloc] initWithFrame:tapFrame] autorelease];
   [navView addSubview:tapView];
   [tapView  respondToTap:@selector(tapNavBar) andTarget:self];
   self._tapView = tapView;
}

此代码用于允许用户在我为 iPhone 编写的名为“六件事”( you can find it here ) 的应用程序中“重置”“Thing Tank”(想想鱼缸)。

这是选择器函数(它不带参数):

-(void)tapNavBar
{
   [[NSNotificationCenter defaultCenter] postNotificationName:[Constants NOTIFICATION_RESTART_BACKGROUND] object:nil];            
}

这是实现，TapView.m。

#import "TapView.h"


@implementation TapView

@synthesize touchedCallback;
@synthesize touchedCallbackTarget;
@synthesize label;

-(TapView*)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if(self)
    {
        self.touchedCallback = nil;
        self.userInteractionEnabled = YES;

      UILabel *lbl = [[UILabel alloc] init];
      lbl.frame = CGRectMake(0, 0, frame.size.width, frame.size.height);
      lbl.backgroundColor = [UIColor clearColor];
      lbl.textColor = [UIColor whiteColor];
      lbl.textAlignment = UITextAlignmentCenter;
      lbl.font = [UIFont boldSystemFontOfSize:16];
      lbl.text = nil;
      lbl.adjustsFontSizeToFitWidth = YES;
      self.label = lbl;
      [self addSubview:lbl];
      [lbl release];
    }
    return self;
}


/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code.
}
*/

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    if(self.touchedCallback != nil && self.touchedCallback != nil)
        [self.touchedCallbackTarget performSelector:self.touchedCallback];
}

-(void)respondToTap:(SEL)withCallback andTarget:(id)target
{
    self.touchedCallback = withCallback;
    self.touchedCallbackTarget = target;
}


- (void)dealloc
{
   self.label = nil;
   [super dealloc];
}


@end

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