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    • 1. 发明申请
    • DEVICES, METHODS, AND GRAPHICAL USER INTERFACES FOR DISPLAYING AN AFFORDANCE ON A BACKGROUND
    • WO2019050562A1
    • 2019-03-14
    • PCT/US2018/015195
    • 2018-01-25
    • APPLE INC.
    • WAN, Wan, SiKARUNAMUNI, Chanaka, G.ALONSO RUIZ, MarcosCIECHANOWSKI, BartoszNIELSEN, Benjamin, E.
    • G06F3/0481
    • An electronic device with a display and a touch-sensitive surface displays, on the display, content and an affordance, wherein: the affordance is displayed over a portion of the content; a value of a display property of the affordance is determined based a value of the same display property of the portion of the content over which the affordance is displayed; and the value of the display property of the content is permitted to vary within a first range of values, and the value of the display property of the affordance is constrained to vary within a second range of values that is smaller than the first range of values; while displaying the content and the affordance, the device detects a change in appearance of the content over which the affordance is displayed; and in response to detecting the change in appearance of the content over which the affordance is displayed, the device changes the appearance of the affordance, including: in accordance with a determination that the value of the display property of the content has decreased, increasing the value of the display property of the affordance in accordance with a magnitude of a change in the value of the display property of the content and the second range of values; and in accordance with a determination that the value of the display property of the content has increased, decreasing the value of the display property of the affordance in accordance with a magnitude of the change in the value of the display property of the content and the second range of values.