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[英]UIView Subclass: Detect the size of a UIView set up in Interface Builder which uses said UIView subclass as a custom class
[英]Detect touch on UIView with Interface Builder
如何仅使用代码(没有Interface Builder)在UIView
的UIviewController
检测触摸?
我找到了touchesBegan方法,但是它从未被调用过。 关于此方法,我没有初始化其他任何事情。
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
#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
我将阅读《 iPhone应用程序编程指南》的“ 触摸事件”部分 。
UIViewController和UIView都是UIResponders ,负责处理事件。
要处理事件,您需要重写touch *方法以执行所需的操作。 要了解发生了哪种触摸事件,请查看UIEvent 。
在你的init方法中:
self.userInteractionEnabled = YES;
对madmik3的更正,
您在initWithFrame中缺少超级调用。
-(id) initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
self.userInteractionEnabled = YES;
} return self;
}
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