變化UIButton的默認操作

Question

如果你有這些控件的一個自定義子類，你要更改>默認操作，附加手勢識別我無法理解在Event Handling Guide for iOS－Interacting with Other User Interface Controls

表達直接到控件而不是>父視圖。然後，手勢識別器首先接收觸摸事件。

任何人都可以舉一些例子嗎？ thx

Answer 1

子類UIButton附加手勢識別器。

在CustomButton.m

#import "CustomButton.h" 

@implementation CustomButton 

- (instancetype)initWithFrame:(CGRect)frame 
{ 
    self = [super initWithFrame:frame]; 
    if (self) { 

     UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] 
               initWithTarget:self action:@selector(handleTap)]; 
     tapGesture.numberOfTapsRequired = 2; 
     [self addGestureRecognizer:tapGesture]; 
    } 
    return self; 
} 

- (void)handleTap 
{ 
    NSLog(@"Button tapped twice"); 
} 

在你的ViewController啓動按鈕，並添加爲子視圖

#import "ViewController.h" 
#import "CustomButton.h" 

@interface ViewController() 

@end 

@implementation ViewController 

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 

    CustomButton *customButton = [[CustomButton alloc] initWithFrame:CGRectMake(100.0f, 100.0f, 150.0f, 100.0f)]; 
    [customButton setTitle:@"Tap Twice" forState:UIControlStateNormal]; 
    customButton.backgroundColor = [UIColor grayColor]; 
    [self.view addSubview:customButton]; 

} 

一般單tap.we按鈕作品加入改變了按鈕的默認行爲輕擊手勢識別器和輕拍數量減去2.