NSArray、NSDictionary 容错处理，防止闪退

安装使用

pod 'YZExtension', '~> 2.0.0'

github demo

说明

在使用 数组或者字典、字符串时，经常遇到越界或者nil对象引起的闪退，在庞杂的项目中，无法逐个排查。
采用 method swizzling实现 这类异常得到修复，在运行中，不能出现闪退

• 数组越界取值

  NSMutableArray *list = [NSMutableArray new];
  id object = [list objectAtIndex:1000];
  NSLog(@"%@",object);// 0x600000446e70 [__NSArrayM objectAtIndex:] index 1000 beyond bounds [0 .. 0]
  
  

• 数组插入nil对象

  NSMutableArray *list = [NSMutableArray new];
  [list insertObject:nil atIndex:0];
  // 0x600000446e70 [__NSArrayM insertObject:atIndex:] object cannot be nil
  [list replaceObjectAtIndex:0 withObject:nil];
  // 0x600000448220 [__NSArrayM replaceObjectAtIndex:withObject:] object cannot be nil
  
  NSArray *array = @[@"aa",text,@"ccc"];
  // 0x6000000031f0 [__NSPlaceholderArray initWithObjects:count:] attempt to insert nil object from objects[1]
  NSLog(@"%@",array);
  /* (
  aa,
  ccc
  ) */
  
  

• 字典添加nil对象

  NSString *text = nil;
  [list addObject:@{@"name":text}];
  NSDictionary *dic = @{@"name":@"aaa",@"age":text,@"sex":@"man"};
  // 0x600000003230 [__NSPlaceholderDictionary initWithObjects:forKeys:count:] attempt to insert nil object from objects[1]
  NSLog(@"%@",dic); 
  /* {
  name = aaa;
  sex = man;
  } */
  
  

• 字典设置 key、object 为nil对象

  NSMutableDictionary *dict = [NSMutableDictionary new];
  [dict setObject:nil forKey:@"test"];
  [dict setObject:@"object" forKey:text];
  // 0x60400023a060 [__NSDictionaryM setObject:forKey:] key cannot be nil (object: object)
  // 0x60400023a060 [__NSDictionaryM setObject:forKey:] object cannot be nil (key: test)
  
  

• NSString 截取越界

  NSString *tmp = @"hello wrold";
  NSString *p = [tmp substringFromIndex:100];
  p = [tmp substringToIndex:300];
  p = [tmp substringWithRange:(NSRange){20,40}];