[英]Forward event from custom UIControl subclass
我的自定义子类扩展UIControl(EditableImageView)基本上它包含3个子视图:
所有类都很好但现在我想将从这个类生成的一些事件连接到另一个。 特别是当按下按钮时,我想将事件转发给所有者viewcontroller,以便我可以处理该事件。 问题是我无法弄清楚如何实现这种行为。 在EditableImageView中,我可以使用[button addTarget:self action:@selector(buttonPressed :) forControlEvents:UIControlEventTouchUpInside]来捕捉触摸事件,但我不知道如何在buttonPressed选择器内转发它。 我也试图实现touchesBegan,但它似乎从未被称为...
我想以这种方式从viewcontroller捕获按钮按下事件:
- (void)viewDidLoad {
[super viewDidLoad];
self.imageButton = [[EditableImageView alloc] initWithFrame:CGRectMake(50.0f, 50.0f, 80.0f, 80.0f)];
[imageButton addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:imageButton];
[imageButton setEditing:NO];
}
这是我的UIControl子类初始化方法:
- (id)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
[self setBackgroundColor:[UIColor clearColor]];
button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(0.0f, 0.0f, frame.size.width, frame.size.height);
[button setImage:[UIImage imageNamed:@"nene_70x70.png"] forState:UIControlStateNormal];
[button addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:button];
transparentLabelBackground = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"editLabelBackground.png"]];
transparentLabelBackground.hidden = YES;
[self addSubview:transparentLabelBackground];
// create edit status label
editLabel = [[UILabel alloc] initWithFrame:CGRectZero];
editLabel.hidden = YES;
editLabel.userInteractionEnabled = NO; // without this assignment the button will not be clickable
editLabel.textColor = [UIColor whiteColor];
editLabel.backgroundColor = [UIColor clearColor];
editLabel.textAlignment = UITextAlignmentLeft;
UIFont *labelFont = [UIFont systemFontOfSize:16.0];
editLabel.font = labelFont;
editLabel.text = @"edit";
labelSize = [@"edit" sizeWithFont:labelFont];
[self addSubview:editLabel];
}
return self;
}
谢谢。
我这样解决了:
EditableImageView.h:
@interface EditableImageView : UIControl {
UIButton *button;
UIImageView *transparentLabelBackground;
UILabel *editLabel;
CGSize labelSize;
BOOL editing;
}
@property (nonatomic, retain) UIButton *button;
@property (nonatomic, retain) UILabel *editLabel;
@property (nonatomic, retain) UIImageView *transparentLabelBackground;
@property (nonatomic, getter=isEditing) BOOL editing;
- (void)buttonPressed:(id)sender;
@end
EditableImageView.m:
(id)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
[self setBackgroundColor:[UIColor clearColor]];
button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(0.0f, 0.0f, frame.size.width, frame.size.height);
[button setImage:[UIImage imageNamed:@"nene_70x70.png"] forState:UIControlStateNormal];
[button addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
.......
}
}
- (void)buttonPressed:(id)sender {
[self sendActionsForControlEvents:UIControlEventTouchUpInside];
}
MyController.m:
- (void)viewDidLoad {
[super viewDidLoad];
self.imageButton = [[EditableImageView alloc] initWithFrame:CGRectMake(50.0f, 50.0f, 80.0f, 80.0f)];
[imageButton addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:imageButton];
}
- (void)buttonPressed:(id)sender {
NSLog(@"buttonPressed!");
}
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