UIView 添加BackViewInit

.h

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface UIView (BackViewInit)
- (void)backViewInit;
@end

NS_ASSUME_NONNULL_END

.m

#import "UIView+BackViewInit.h"
#import <objc/runtime.h>

@implementation UIView (BackViewInit)
+ (void)load{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        Method originalMethod = class_getInstanceMethod(self, @selector(initWithFrame:));
        Method swizzledMethod = class_getInstanceMethod(self, @selector(jc_initWithFrame:));
        method_exchangeImplementations(originalMethod, swizzledMethod);
    });
}
- (instancetype)jc_initWithFrame:(CGRect)frame{
    UIView *obj = [self jc_initWithFrame:frame];
    [obj backViewInit];
    return obj;
}

- (void)backViewInit{
    
}

@end