實際開發(fā)中經常遇到因為Button太小導致用戶無法點擊到有效區(qū)域影響體驗铃剔，這時就要增加點擊范圍檀葛。這里我們給Button添加分類的方法處理麦备。（文章末有下載地址）
關聯(lián)上左下右延伸值
#import "UIButton+EnlargeEdge.h"
#import <objc/runtime.h>
@implementation UIButton (EnlargeEdge)
static char topNameKey;
static char rightNameKey;
static char bottomNameKey;
static char leftNameKey;
- (void)setEnlargeEdgeWithTop:(CGFloat)top right:(CGFloat)right bottom:(CGFloat)bottom left:(CGFloat)left {
objc_setAssociatedObject(self, &topNameKey, [NSNumber numberWithFloat:top], OBJC_ASSOCIATION_COPY_NONATOMIC);
objc_setAssociatedObject(self, &rightNameKey, [NSNumber numberWithFloat:right], OBJC_ASSOCIATION_COPY_NONATOMIC);
objc_setAssociatedObject(self, &bottomNameKey, [NSNumber numberWithFloat:bottom], OBJC_ASSOCIATION_COPY_NONATOMIC);
objc_setAssociatedObject(self, &leftNameKey, [NSNumber numberWithFloat:left], OBJC_ASSOCIATION_COPY_NONATOMIC);
}
獲取范圍延伸區(qū)域
NSNumber* topEdge = objc_getAssociatedObject(self, &topNameKey);
NSNumber* rightEdge = objc_getAssociatedObject(self, &rightNameKey);
NSNumber* bottomEdge = objc_getAssociatedObject(self, &bottomNameKey);
NSNumber* leftEdge = objc_getAssociatedObject(self, &leftNameKey);
if (topEdge && rightEdge && bottomEdge && leftEdge){
return CGRectMake(self.bounds.origin.x - leftEdge.floatValue,
self.bounds.origin.y - topEdge.floatValue,
self.bounds.size.width + leftEdge.floatValue + rightEdge.floatValue,
self.bounds.size.height + topEdge.floatValue + bottomEdge.floatValue);
}else{
return self.bounds;
}
設置點擊區(qū)域
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
CGRect rect = [self enlargedRect];
if (CGRectEqualToRect(rect, self.bounds)){
return [super pointInside:point withEvent:event];
}
return CGRectContainsPoint(rect, point) ? YES : NO;
}
調用方法
[arrowButton setEnlargeEdgeWithTop:10 right:10 bottom:10 left:5];
