How to debug who is eating my touches in UIKit?

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You can debug that by using a symbolic breakpoint:

-[UIWindow sendEvent:] & po $arg3

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Logs:

<UITouchesEvent: 0x6000026fa6d0> timestamp: 179462 touches: {(
<UITouch: 0x7f84d6f10380> phase: Began tap count: 1 force: 0.000 
window: <UIWindow: 0x7f84d6d0ad10; frame = (0 0; 375 812); autoresize = W+H; 
gestureRecognizers = <NSArray: 0x600001aa8870>; layer = <UIWindowLayer: 0x6000014bd7e0>> view: <UIView: 0x7f84d6d0bff0; frame = (0 0; 375 812); 
autoresize = W+H; layer = <CALayer: 0x6000014bdc60>> location in window: {165.66665649414062, 232.33332824707031} previous location in window: 
{165.66665649414062, 232.33332824707031} location in view: {165.66665649414062, 
232.33332824707031} previous location in view: {165.66665649414062,232.33332824707031}
)}

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