Keep the button selected and the button that was selected before clicking the other button reverts to implementing the code as it was

Test can be copied directly

#import "ViewController.h"

@interface Viewcontroller ()

{

Nsinteger num;

}

@end

@implementation Viewcontroller

-(void) Viewdidload {

[Super Viewdidload];

num =-1;

[Self layoutview];

}

-(void) Layoutview

{

int totalloc=3;

int count = 6;

CGFloat appvieww=100;

CGFloat appviewh=100;

CGFloat margin= (SELF.VIEW.FRAME.SIZE.WIDTH-TOTALLOC*APPVIEWW)/(totalloc+1);

for (int i=0; i<count; i++) {

int row=i/totalloc;

int loc=i%totalloc;

CGFloat appviewx=margin+ (MARGIN+APPVIEWW) *loc;

CGFloat appviewy=margin+ (MARGIN+APPVIEWH) *row;

UIButton *button = [UIButton buttonwithtype:uibuttontypecustom];

Button.frame = CGRectMake (appviewx, Appviewy, APPVIEWW, APPVIEWH);

[Button settitle:@ "forstate:uicontrolstatenormal];

[Button Settitlecolor:[uicolor Bluecolor] forstate:uicontrolstatenormal];

[Button Settitlecolor:[uicolor Redcolor] forstate:uicontrolstateselected];

Button.tag = i +1;

[Button addtarget:self Action: @selector (click:) forcontrolevents:uicontroleventtouchupinside];

[Self.view Addsubview:button];

}

}

-(void) Click: (UIButton *) button

{

UIButton *BTN1 = (UIButton *) [Self.view viewwithtag:num];

if (num! = 0)

{

btn1.selected = NO;

}

num = Button.tag;

button.selected = YES;

}

@end

@end

Keep the button selected and the button that was selected before clicking the other button reverts to implementing the code as it was