JSJP_Student/jiaPei/Category/NSMutableArray/NSMutableArray+RQSafe.m

//
//  NSMutableArray+RQSafe.m
//  jiaPei
//
//  Created by 张嵘 on 2019/4/2.
//  Copyright © 2019 JCZ. All rights reserved.
//

#import "NSMutableArray+RQSafe.h"

@implementation NSMutableArray (RQSafe)
static char const *name = "__NSArrayM";
+ (void)load {
	static dispatch_once_t onceToken;
	dispatch_once(&onceToken, ^{
		[objc_getClass(name) methodSwizzlingWithOriginalSelector:@selector(addObject:) bySwizzledSelector:@selector(safeAddObject:)];
		[objc_getClass(name) methodSwizzlingWithOriginalSelector:@selector(removeObject:) bySwizzledSelector:@selector(safeRemoveObject:)];
		[objc_getClass(name) methodSwizzlingWithOriginalSelector:@selector(removeObjectAtIndex:) bySwizzledSelector:@selector(safeRemoveObjectAtIndex:)];
		[objc_getClass(name) methodSwizzlingWithOriginalSelector:@selector(insertObject:atIndex:) bySwizzledSelector:@selector(safeInsertObject:atIndex:)];
		[objc_getClass(name) methodSwizzlingWithOriginalSelector:@selector(objectAtIndex:) bySwizzledSelector:@selector(safeObjectAtIndex:)];
	});
}
- (void)safeAddObject:(id)obj {
	if (obj == nil) {
		NSLog(@"%s can add nil object into NSMutableArray", __FUNCTION__);
		return;
	}
	[self safeAddObject:obj];
}
- (void)safeRemoveObject:(id)obj {
	if (obj == nil) {
		NSLog(@"%s call -removeObject:, but argument obj is nil", __FUNCTION__);
		return;
	}
	[self safeRemoveObject:obj];
}
- (void)safeRemoveObjectAtIndex:(NSUInteger)index {
	if (self.count <= 0) {
		NSLog(@"%s can't get any object from an empty array", __FUNCTION__);
	} else if (index >= self.count) {
		NSLog(@"%s index out of bound", __FUNCTION__);
	} else {
		[self safeRemoveObjectAtIndex:index];
	}
}
- (void)safeInsertObject:(id)anObject atIndex:(NSUInteger)index {
	if (anObject == nil) {
		NSLog(@"%s can't insert nil into NSMutableArray", __FUNCTION__);
	} else if (index > self.count) {
		NSLog(@"%s: index is invalid", __FUNCTION__);
	} else {
		[self safeInsertObject:anObject atIndex:index];
	}
}
- (id)safeObjectAtIndex:(NSUInteger)index {
	if (self.count == 0) {
		NSLog(@"%s can't get any object from an empty array", __FUNCTION__);
		return nil;
	} else if (index > self.count  - 1) {
		// [__NSArrayM objectAtIndex:]: index 2 beyond bounds [0 .. 1]
		NSLog(@"%s: index %ld beyond bounds [0..%ld]", __FUNCTION__, index, self.count);
		return nil;
	} else {
		return [self safeObjectAtIndex:index];
	}
}

@end