使用界面生成器檢測UIView上的觸摸

Question

如何使用代碼（無Interface Builder）在UIviewController中檢測UIView中的觸摸？

我發現了touchesBegan方法，但它不會被調用。我沒有初始化關於這種方法的其他任何內容。

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 

Answer 1

#import "TouchView.h" 


//TouchView.h 

#import <Foundation/Foundation.h> 
#import "TouchViewDelegate.h" 

@interface TouchView : UIView { 
    id <TouchViewDelegate> delegate; 
} 
@property (retain) id delegate; 
@end 

//TouchView.m 

@implementation TouchView 
@synthesize delegate; 

-(id) initWithFrame:(CGRect)frame 
{ 
    self.userInteractionEnabled = YES; 
    return self; 
} 
-(id) initWithCoder:(NSCoder *)aDecoder 
{ 
    self.userInteractionEnabled = YES; 
    return self; 
} 
-(void) awakeFromNib 
{ 
    self.userInteractionEnabled = YES; 
} 
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    [delegate touchDown:self]; 
} 
-(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    [delegate touchUp:self]; 
} 
@end 

//TouchViewDelegate.h 
#import <UIKit/UIKit.h> 


@protocol TouchViewDelegate 
-(void) touchDown:(id) sender; 
-(void) touchUp:(id)sender; 
@end 

Answer 2

我會閱讀iPhone應用程序編程指南的Touch Events sections。

UIViewController和UIView都是UIResponders，它負責處理事件。

要處理事件，您需要重寫touch *方法來執行所需操作。要知道發生了什麼樣的觸摸事件，請查看UIEvent。

Answer 3

在您的init方法：

self.userInteractionEnabled = YES; 

Answer 4

修正爲madmik3，

你缺少你initWithFrame超級調用。

-(id) initWithFrame:(CGRect)frame { 
if (self = [super initWithFrame:frame]) { 
self.userInteractionEnabled = YES; 
} return self; 
}