Event recognition

An electronic device, comprising:

• a display;
• one or more processors;
• and
• memory storing software that includes a view hierarchy with a plurality of views and instructions, which, when executed by the one or more processors, cause the electronic device to perform a method including:
• displaying at least a first view of the plurality of views;
• detecting one or more sub-events at the first view, wherein:
• the plurality of views includes two or more gesture recognizers including a first gesture recognizer in the first view;
• each of the two or more gesture recognizers is configured to transition among a plurality of predefined states;
• and
• the first gesture recognizer is associated with a wait-for list that identifies a set of gesture recognizers, wherein the first gesture recognizer is configured to recognize the one or more sub-events only after each gesture recognizer in the set of gesture recognizers enters into a respective state, of the plurality of predefined states, indicating that the gesture recognizer has not recognized the one or more sub-events;
• determining whether the gesture recognizers in the set of gesture recognizers have entered into respective states, of the plurality of predefined states, indicating that the gesture recognizers have not recognized the one or more sub-events;
• and,
• in accordance with a determination that the gesture recognizers in the set of gesture recognizers have entered into the respective states of the plurality of predefined states, recognizing the one or more sub-events with the first gesture recognizer.

A non-transitory computer readable storage medium storing software that includes a view hierarchy with a plurality of views and instructions for execution by one of more processors of an electronic device, the instructions for:

• displaying at least a first view of the plurality of views;
• detecting one or more sub-events at the first view, wherein:
• the plurality of views includes two or more gesture recognizers including a first gesture recognizer in the first view;
• each of the two or more gesture recognizers is configured to transition among a plurality of predefined states;
• and
• the first gesture recognizer is associated with a wait-for list that identifies a set of gesture recognizers, wherein the first gesture recognizer is configured to recognize the one or more sub-events only after each gesture recognizer in the set of gesture recognizers enters into a respective state, of the plurality of predefined states, indicating that the gesture recognizer has not recognized the one or more sub-events;
• determining whether the gesture recognizers in the set of gesture recognizers have entered into respective states, of the plurality of predefined states, indicating that the gesture recognizers have not recognized the one or more sub-events;
• and,
• in accordance with a determination that the gesture recognizers in the set of gesture recognizers have entered into the respective states of the plurality of predefined states, recognizing the one or more sub-events with the first gesture recognizer.