Returns an NSString object initialized by using a given format string as a template into which the remaining argument values are substituted.
Returns a string created by using a given format string as a template into which the remaining argument values are substituted.
The integer value of the string. (read-only) 啊不错的风格hi就看了么
Returns a new string made by appending a given string to the receiver.
Returns a string made by appending to the receiver a string constructed from a given format string and the following arguments.
Returns a string object containing the characters of the receiver that lie within a given range.
Returns an array containing substrings from the receiver that have been divided by a given separator.
Finds and returns the range of the first occurrence of a given string within the receiver.
Returns a new string in which all occurrences of a target string in the receiver are replaced by another given string.
Returns a Boolean value that indicates whether a given string matches the beginning characters of the receiver.
Returns a Boolean value that indicates whether a given string matches the ending characters of the receiver.
Returns a Boolean value that indicates whether a given string is equal to the receiver using a literal Unicode-based comparison.
An uppercase representation of the string. (read-only)
A capitalized representation of the receiver. (read-only)
Adds to the end of the receiver the characters of a given string.
Removes from the receiver the characters in a given range.
Replaces the characters from aRange with those in aString.
Replaces the characters of the receiver with those in a given string.
Initializes a newly allocated array by placing in it the objects in the argument list.
Returns the number of objects currently in the array.
Creates and returns an array containing the objects in the argument list.
Returns the object located at the specified index.
Returns a Boolean value that indicates whether a given object is present in the array.
Returns the last object in the array.
Returns the lowest index whose corresponding array value is equal to a given object.
Creates and returns an NSMutableArray object with enough allocated memory to initially hold a given number of objects.
Inserts a given object at the end of the array.
Inserts a given object into the array's contents at a given index.
Replaces the object at index with anObject.
Exchanges the objects in the array at given indices.
Removes the object at index .
Creates and returns an NSNumber object containing a given value, treating it as a signed int.
Initializes a newly allocated dictionary with entries constructed from the specified set of values and keys.
Creates and returns a dictionary containing a given key and value.
Returns the value associated with a given key.
Returns a new array containing the dictionary’s keys.
Returns a new array containing the dictionary’s values.
Returns the value associated with a given key.
Returns a new array containing the keys corresponding to all occurrences of a given object in the dictionary.
Adds a given key-value pair to the dictionary.
Invokes setValue:forKey: on each of the set’s members.
现在总结他们2者的区别就是：
1, setObject：forkey：中value是不能够为nil的，不然会报错。
setValue：forKey：中value能够为nil，但是当value为nil的时候，会自动调用removeObject：forKey方法
2, setValue：forKey：中key的参数只能够是NSString类型，而setObject：forKey：的可以是任何类型
Removes a given key and its associated value from the dictionary.
Removes from the dictionary entries specified by elements in a given array.
Empties the dictionary of its entries.
Returns an array that lists the receiving array’s elements in ascending order, as determined by the comparison method specified by a given selector.
return NSOrderedAscending(升序排列)return NSOrderedSame(相等)return NSOrderedDescending(降序排列)Creates and returns a set containing the objects in a given argument list.
Returns a Boolean value that indicates whether the receiver is an instance of given class or an instance of any class that inherits from that class. (required)
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