添加addTarget：方法来定制UIView

Question

我创建了一个像UIStepper这样的自定义UIView，因为我不喜欢UIStepper的外观。我想UIStepper有个人计数标签，所以我将它添加到我的自定义视图中，并创建了一个增加 - 减少它的方法。现在我需要一个[customView addTarget：（id）action：（del）forControlEvents：（UIControlEvents）]捕捉方法UIControlEventValueChanged;但我找不到任何有关实施它的事情。我围绕UIButton.h，UIStepper.h文件进行了挖掘，但没有运气。谁能帮我做到这一点？

这里是我创建的自定义视图...

CounterView.h

#import <UIKit/UIKit.h> 

@interface CounterView : UIView 
@property NSString* name; 
@property NSInteger count; 
@property UILabel *label; 
@property NSInteger customTag; 

- (id)initWithX:(CGFloat)xPoint WithY:(CGFloat)yPoint WithName:(NSString*)newName withCount:(NSInteger)newCount withCustomTag:(NSInteger)newTag; 
@end 

CounterView.m

@implementation CounterView 

- (id)initWithX:(CGFloat)xPoint WithY:(CGFloat)yPoint WithName:(NSString*)newName withCount:(NSInteger)newCount withCustomTag:(NSInteger)newTag 
{ 
self = [super initWithFrame:CGRectMake(xPoint, yPoint, 24, 52)]; 
if (self) { 
    self.customTag = newTag; 
    self.count = newCount; 
    self.name = newName; 

    UIButton *btnUp = [[UIButton alloc] initWithFrame:CGRectMake(3, 2, 18, 12)]; 
    [btnUp setImage:[UIImage imageNamed:@"top.png"] forState:UIControlStateNormal]; 
    [btnUp addTarget:self action:@selector(increaseValue) forControlEvents:UIControlEventTouchUpInside]; 
    UIButton *btnDown = [[UIButton alloc] initWithFrame:CGRectMake(3, 38, 18, 12)]; 
    [btnDown setImage:[UIImage imageNamed:@"bottom.png"] forState:UIControlStateNormal]; 
    [btnDown addTarget:self action:@selector(decreaseValue) forControlEvents:UIControlEventTouchUpInside]; 
    self.label = [[UILabel alloc] initWithFrame:CGRectMake(0, 14, 24, 24)]; 
    [self.label setText:[NSString stringWithFormat:@"%ld", (long)self.count]]; 
    self.label.textAlignment = NSTextAlignmentCenter; 

    [self addSubview:btnUp]; 
    [self addSubview:btnDown]; 
    [self addSubview:self.label]; 
} 
return self; 
} 

-(void) increaseValue{ 
self.count++; 
[self.label setText:[NSString stringWithFormat:@"%ld", (long)self.count]]; 
} 
-(void) decreaseValue{ 
self.count--; 
[self.label setText:[NSString stringWithFormat:@"%ld", (long)self.count]]; 
} 
@end 

Answer 1

只要允许动作被设置从你的控制之外。这里是如何做到这一点：

@interface CounterView : UIView 
... 
@property(nonatomic, strong) UIButton *btnUp; 
@property(nonatomic, strong) UIButton *btnDown; 

- (void)addUpTarget:(id)target action:(SEL)action; 
- (void)addDownTarget:(id)target action:(SEL)action; 

@end 

@implementation CounterView 

... 

- (void)addUpTarget:(id)target action:(SEL)action 
{ 
    [_btnUp addTarget:target action:action forControlEvents:UIControlEventTouchUpInside]; 
} 

- (void)addDownTarget:(id)target action:(SEL)action 
{ 
    [_btnDonw addTarget:target action:action forControlEvents:UIControlEventTouchUpInside]; 
} 

... 

@end 

然后使用方法：

- (void)addUpTarget:(id)target action:(SEL)action; 
- (void)addDonwTarget:(id)target action:(SEL)action; 

设定的目标和行动增加和减少的值。

在视图控制器

Answer 2

你实例您CounterView添加此

UITapGestureRecognizer *singleFingerTap = 
    [[UITapGestureRecognizer alloc] initWithTarget:self 
              action:@selector(handleSingleTap:)]; 
[yourViewInstantiation addGestureRecognizer:singleFingerTap]; 
[singleFingerTap release]; 

与您实现回调方法：

- (void)handleSingleTap:(UITapGestureRecognizer *)recognizer { 
    CGPoint location = [recognizer locationInView:[recognizer.view superview]]; 

    //Do stuff here... 
} 

我希望帮助你！