ios - How to remove gradient effect for UIButton after setting once - iPhone -
i using uibutton soft key items. when click show color effects button. used below code it.
[btn settitlecolor:[uicolor lightgraycolor] forstate:uicontrolstatehighlighted]; cagradientlayer *btngradient = [cagradientlayer layer]; btngradient.frame = btn.bounds; btngradient.colors = [nsarray arraywithobjects: (id)[[uicolor colorwithred:255.0f/255.0f green:255.0f/255.0f blue:255.0f/255.0f alpha:.6f] cgcolor], (id)[[uicolor colorwithred:200.0f/255.0f green:200.0f/255.0f blue:200.0f/255.0f alpha:.4f] cgcolor], (id)[[uicolor colorwithred:150.0f/255.0f green:150.0f/255.0f blue:150.0f/255.0f alpha:.4f] cgcolor], (id)[[uicolor colorwithred:100.0f/255.0f green:100.0f/255.0f blue:100.0f/255.0f alpha:.4f] cgcolor], (id)[[uicolor colorwithred:50.0f/255.0f green:50.0f/255.0f blue:50.0f/255.0f alpha:.4f] cgcolor], (id)[[uicolor colorwithred:5.0f/255.0f green:5.0f/255.0f blue:5.0f/255.0f alpha:.4f] cgcolor], nil]; [btn.layer insertsublayer:btngradient atindex:0]; cagradientlayer *glosslayer = [cagradientlayer layer]; glosslayer.frame = btn.bounds; glosslayer.colors = [nsarray arraywithobjects: (id)[uicolor colorwithwhite:1.0f alpha:0.4f].cgcolor, (id)[uicolor colorwithwhite:1.0f alpha:0.1f].cgcolor, (id)[uicolor colorwithwhite:0.75f alpha:0.0f].cgcolor, (id)[uicolor colorwithwhite:1.0f alpha:0.1f].cgcolor, nil]; glosslayer.locations = [nsarray arraywithobjects: [nsnumber numberwithfloat:0.0f], [nsnumber numberwithfloat:0.5f], [nsnumber numberwithfloat:0.5f], [nsnumber numberwithfloat:1.0f], nil]; [btn.layer insertsublayer:glosslayer atindex:0]; calayer *btnlayer = [btn layer]; [btnlayer setmaskstobounds:yes]; uicolor*mycolor = btn.backgroundcolor; [btn.layer setbordercolor:[mycolor cgcolor]]; trying remove gradient effects button in below way. making alpha zero.. didnt work..
-(void) removegradient:(uibutton *)btn{ cagradientlayer *btngradient = [cagradientlayer layer]; btngradient.frame = btn.bounds; btngradient.colors = [nsarray arraywithobjects: (id)[[uicolor colorwithred:255.0f/255.0f green:255.0f/255.0f blue:255.0f/255.0f alpha:.0f] cgcolor], (id)[[uicolor colorwithred:200.0f/255.0f green:200.0f/255.0f blue:200.0f/255.0f alpha:.0f] cgcolor], (id)[[uicolor colorwithred:150.0f/255.0f green:150.0f/255.0f blue:150.0f/255.0f alpha:.0f] cgcolor], (id)[[uicolor colorwithred:100.0f/255.0f green:100.0f/255.0f blue:100.0f/255.0f alpha:.0f] cgcolor], (id)[[uicolor colorwithred:50.0f/255.0f green:50.0f/255.0f blue:50.0f/255.0f alpha:.0f] cgcolor], (id)[[uicolor colorwithred:5.0f/255.0f green:5.0f/255.0f blue:5.0f/255.0f alpha:.0f] cgcolor], nil]; [btn.layer insertsublayer:btngradient atindex:0]; cagradientlayer *glosslayer = [cagradientlayer layer]; glosslayer.frame = btn.bounds; glosslayer.colors = [nsarray arraywithobjects: (id)[uicolor colorwithwhite:1.0f alpha:0.0f].cgcolor, (id)[uicolor colorwithwhite:1.0f alpha:0.0f].cgcolor, (id)[uicolor colorwithwhite:0.75f alpha:0.0f].cgcolor, (id)[uicolor colorwithwhite:1.0f alpha:0.0f].cgcolor, nil]; glosslayer.locations = [nsarray arraywithobjects: [nsnumber numberwithfloat:0.0f], [nsnumber numberwithfloat:0.5f], [nsnumber numberwithfloat:0.5f], [nsnumber numberwithfloat:1.0f], nil]; //[btn.layer insertsublayer:glosslayer atindex:0]; calayer *btnlayer = [btn layer]; [btnlayer setmaskstobounds:yes]; } here, if click once working fine. if click on button repeatedly, color reapplied button , after around 10 clicks button turns in white color.
i think have remove prior gradient effect layer if have redo effect. how remove gradient effect on layer after setting once.
thanks jithen
what asking common , can achieved through subclassing uibutton. after have created subclass add uiresponder touchevents subclass. in uibutton subclass, setup ivar gradient , in touches began , touches ended, change the properties of gradient. on touch began can invert , on touches ended can set original gradient.
- subclass uibutton
- create ivar cagradient
- setup gradient in initwithframe method of uibutton subclass
- add uiresponder touch methods
- in touchesbegan - modify gradient desire.
- repeat step 5 in touchesended
again suggest subclassing because need capture touch events button. cannot in main view controller have setup button in.
let me know if helps.
edit #1 - take @ example below:
-(void) touchesbegan:(nsset *)touches withevent:(uievent *)event{ gradient.colors = [nsarray arraywithobjects:(id)[uicolor colorwithwhite:0.0f alpha:0.25f].cgcolor, (id)[uicolor colorwithwhite:0.0f alpha:0.25f].cgcolor, nil]; gradient.locations = [nsarray arraywithobjects: [nsnumber numberwithfloat:0.0f], [nsnumber numberwithfloat:0.75f], nil]; } -(void)touchesended:(nsset *)touches withevent:(uievent *)event{ gradient.colors = [nsarray arraywithobjects:(id)[uicolor colorwithwhite:1.0f alpha:0.25f].cgcolor, (id)[uicolor colorwithwhite:0.0f alpha:0.25f].cgcolor, nil]; gradient.locations = [nsarray arraywithobjects: [nsnumber numberwithfloat:0.0f], [nsnumber numberwithfloat:0.75f], nil]; } if notice modifying existing gradient. not creating new 1 each time. values have not work concept of not creating new gradient each tap. modifying gradient property only.
edit #2 - create ivar gradients:
- go the uibutton subclass header
add under interface section:
cagradientlayer *btngradient;
cagradientlayer *glosslayer;
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