子類UIButton添加屬性我想子類UIButton添加一些我需要的屬性（不是方法...只有屬性）。這是我的子類的代碼：//.h-----------------------@interface MyButton : UIButton{
MyPropertyType *property;}@property (nonatomic,retain) MyPropertyType *property;@end//.m--------------------------@implementation MyButton@synthesize property;@end在這里我如何使用該類：MyButton *btn = ((MytButton *)[MyButton buttonWithType:UIButtonTypeRoundedRect]);btn.property = SomeDataForTheProperty;從哪里獲得此錯誤： -[UIRoundedRectButton setProperty:]: unrecognized selector sent to instance 0x593e920因此，從ButtonWithType我獲得一個UIRoundedRectButton，(Mybutton *)不能施展它...我需要做什么來獲得一個MyButton對象？是-init唯一的解決方案？謝謝！
3 回答
眼眸繁星
TA貢獻(xiàn)1873條經(jīng)驗 獲得超9個贊
我有一個簡單的方案，只涉及一些庫方法，沒有樣板，只有3行代碼，你想要添加每個屬性。下面添加了兩個示例屬性：startPoint和tileState。為了便于說明，這里是您需要為像tileState這樣的屬性添加的行：
//@property (assign, nonatomic) SCZTileState tileState; // tileState line 1
//@property (assign, nonatomic) SCZTileState tileState; // tileState line 2
//@dynamic tileState; // tileState line 3
我的博客文章中有更多細(xì)節(jié)描述了它的工作原理
的UIButton + SCZButton.h
#import <UIKit/UIKit.h>
@interface UIButton (SCZButton)
@property (readwrite, nonatomic) id assocData;
@end
的UIButton + SCZButton.m
// UIButton+SCZButton.m
// Copyright (c) 2013 Ooghamist LLC. All rights reserved.
#import "UIButton+SCZButton.h"
#import <objc/runtime.h>
@implementation UIButton (SCZButton)
- (id)assocData {
id data = objc_getAssociatedObject(self, "SCZButtonData");
return data;
}
- (void)setAssocData:(id)data {
objc_setAssociatedObject(self, "SCZButtonData", data,
OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
@end
OOGTotallyTile.h
// UIButton+OOGTotallyTile.m
// Copyright (c) 2013 Ooghamist LLC. All rights reserved.
#import <UIKit/UIKit.h>
#import "UIButton+SCZButton.h"
#define kPointLabelTag 837459
typedef enum {
SCZTileStatePlaced,
SCZTileStateDropping,
SCZTileStateDropped
} SCZTileState;
@interface SCZButtonData : NSObject
@property (assign, nonatomic) CGPoint startPoint;
@property (assign, nonatomic) SCZTileState tileState; // tileState line 1
@end
@interface UIButton (OOGTotallyTile)
@property (readonly, nonatomic) SCZButtonData *buttonData;
@property (assign, nonatomic) CGPoint startPoint;
@property (assign, nonatomic) SCZTileState tileState; // tileState line 2
@end
OOGTotallyTile.m
// UIButton+OOGTotallyTile.m
// Copyright (c) 2013 Ooghamist LLC. All rights reserved.
#import "OOGTotallyTile.h"
@implementation SCZButtonData
@end
@implementation UIButton (OOGTotallyTile)
@dynamic startPoint;
@dynamic tileState; // tileState line 3
- (SCZButtonData*)buttonData {
if ( ! self.assocData) {
self.assocData = [[SCZButtonData alloc] init];
}
return self.assocData;
}
- (id)forwardingTargetForSelector:(SEL)aSelector {
id forwardingTarget = [super forwardingTargetForSelector:aSelector];
if ( ! forwardingTarget) {
return [self buttonData];
}
return forwardingTarget;
}
@end
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