objective c how to set exclusive touch for all UIbuttons on the whole app

Question

My app has many buttons through out the application

I want to set Exclusive Touch all of them together at one time. or all views in the app

we can set individually by

[button setExclusiveTouch:YES];

But i want to set at a time for all the buttons in the application

Can we set all view exclusive touch ?

any body have any idea please suggest me.

Answer 1

The most elegant and actually the designed way to do this is by using the appearance proxy, which is designed to set a defined behaviour or appearance across the board for a given UI component.

[[UIButton appearance] setExclusiveTouch:YES];

For more information: Apple Documentation - UIAppearance and NSHipster - UIAppearance

Answer 2

You can try this

// Not tested
for (UIView * button in [myView subviews]) {
    if([button isKindOfClass:[UIButton class]])
        [((UIButton *)button) setExclusiveTouch:YES];
}

Answer 3

If you really want to set exclusiveTouch for ALL UIButtons + subclasses in your whole application and not just a single view, you can use method swizzling .

You use the objc runtime to override willMoveToSuperview and set exclusive touch there. This is very reliable and i've never had any problems using this technique.

I like doing this especially for UISwitch , because touch-handling for switches can be a bit tricky and exclusiveTouch will help avoid bugs caused by simultaneous taps on different switches

Sample taken from the link above and changed so that exclusiveTouch is set:

#import <objc/runtime.h>


@implementation UIButton (INCButton)

+ (void)load
{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        Class class = [self class];

        SEL originalSelector = @selector(willMoveToSuperview:);
        SEL swizzledSelector = @selector(inc_willMoveToSuperview:);

        Method originalMethod = class_getInstanceMethod(class, originalSelector);
        Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);

        BOOL didAddMethod =
        class_addMethod(class,
                    originalSelector,
                    method_getImplementation(swizzledMethod),
                    method_getTypeEncoding(swizzledMethod));

        if (didAddMethod) {
            class_replaceMethod(class,
                            swizzledSelector,
                            method_getImplementation(originalMethod),
                            method_getTypeEncoding(originalMethod));
        } else {
            method_exchangeImplementations(originalMethod, swizzledMethod);
        }
    });
}

- (void)inc_willMoveToSuperview:(UIView *)newSuperview
{
    // This is correct and does not cause an infinite loop!
    // See the link for an explanation 
    [self inc_willMoveToSuperview:newSuperview];

    [self setExclusiveTouch:YES];
}

@end

Create a category and insert this code for each class you want to alter.

Answer 4

why so difficult? Make a category

@implementation UIButton (ExclusiveTouch)

- (BOOL)isExclusiveTouch
{
    return YES;
}

@end

Answer 5

循环浏览最顶层视图的子视图（递归），对于UIButton类型的每个对象，应用独占触摸