iOS 子檢視超出父檢視不響應解決辦法
阿新 • • 發佈:2019-02-05
父檢視中重寫該方法
Objective-C
- (nullable UIView *)hitTest:(CGPoint)point withEvent:(nullable UIEvent *)event { UIView * view = [super hitTest:point withEvent:event]; if (view == nil) { for (UIView * subView in self.subviews) { // 將座標系轉化為自己的座標系 CGPoint tp = [subView convertPoint:point fromView:self]; if (CGRectContainsPoint(subView.bounds, tp)) { view = subView; } } } return view; }
Swift
override func hitTest(point: CGPoint, withEvent event: UIEvent?) -> UIView? { var view = super.hitTest(point, withEvent: event) if view == nil { for subView in self.subviews { let tp = subView.convertPoint(point, fromView: self) if CGRectContainsPoint(subView.bounds, tp) { view = subView } } } return view }
測試程式碼
override func viewDidLoad() { super.viewDidLoad() let costemView = CustomView(frame: CGRectMake(100, 100 , 100, 100)) self.view.addSubview(costemView) let button = UIButton(frame: CGRectMake(-20, -20, 40, 40)) costemView.addSubview(button) button.backgroundColor = UIColor.lightGrayColor() button.addTarget(self, action: #selector(aaa), forControlEvents: .TouchUpInside) } func aaa() -> Void { print("dafd") }
在父試圖裡面處理但是這樣處理不太優雅
這裡有更優雅的處理方法
UIView+Chain.h
@interface UIView (Chain)
@property (nonatomic, assign) BOOL ableRespose;
@end
UIView+Chain.m
@implementation UIView (Chain)
+ (void)load {
Class class = self;
Method originMethod = class_getInstanceMethod(class, @selector(hitTest:withEvent:));
Method targetMethod = class_getInstanceMethod(class, @selector(exchange_hitTest:withEvent:));
if (!originMethod || !targetMethod) {
NSLog(@"交換失敗");
return;
}
BOOL didAddMethod = class_addMethod(class,@selector(hitTest:withEvent:), method_getImplementation(targetMethod), method_getTypeEncoding(targetMethod));
if (didAddMethod) {
class_replaceMethod(class,@selector(exchange_hitTest:withEvent:), method_getImplementation(originMethod), method_getTypeEncoding(originMethod));
} else {
method_exchangeImplementations(originMethod, targetMethod);
}
}
- (UIView *)exchange_hitTest:(CGPoint)point withEvent:(UIEvent *)event {
UIView * view = [self exchange_hitTest:point withEvent:event];
if (view) {
return view;
} else {
for (UIView * v in self.subviews) {
if (v.ableRespose) {
if (CGRectContainsPoint(v.frame, point)) {
return v;
}
}
}
return nil;
}
}
- (void)setAbleRespose:(BOOL)ableRespose {
objc_setAssociatedObject(self, @selector(ableRespose), @(ableRespose), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (BOOL)ableRespose {
return objc_getAssociatedObject(self, _cmd) != nil ? [objc_getAssociatedObject(self, _cmd) boolValue] : NO;
}
@end
只需要設定超出範圍的檢視的ableRespose屬性為YES就可以了