//
// main.m
// OC9_字符串的内存管理
//
// Created by zhangxueming on 15/6/18.
// Copyright (c) 2015年 zhangxueming. All rights reserved.
//
#import <Foundation/Foundation.h>
//字符串内存管理, retainCount的值可以不参考, 只需要遵守内存管理法则就行
int main(
int argc,
const char *
argv[]) {
@autoreleasepool {
NSString *str1 =
@"hello world";
NSLog(@"str1 retainCount = %li", str1.retainCount);
NSString *str2 =
[NSString stringWithString:str1];
NSLog(@"str2 retainCount = %li", str2.retainCount);
NSString *str3 =
[[NSString alloc] initWithString:str1];
NSLog(@"str3 retainCount = %li",str3.retainCount);
NSLog(@"str1 = %p str2 = %p str3 = %p", str1, str2, str3);
[str3 release];
NSString *str4 =
[str3 retain];
NSLog(@"str4 retainCount = %li", str4.retainCount);
[str4 release];
NSString *str5 =
[str4 copy];
NSLog(@"str5 retainCount = %li", str5.retainCount);
NSLog(@"str5 = %p str4 = %p", str5, str4);
[str5 release];
NSMutableString *mulStr1 =
[[NSMutableString alloc] initWithString:str5];
NSLog(@"mulStr1 retainCount = %li", mulStr1.retainCount);
NSLog(@"mulStr1 = %p str5 = %p", mulStr1, str5);
NSMutableString *mulStr2 =
[mulStr1 retain];
NSLog(@"mulStr2 retainCount = %li", mulStr2.retainCount);
NSString *str6 =
[[NSString alloc] initWithString:mulStr1];
NSLog(@"str6 retainCount = %li", str6.retainCount);
NSString *str7 = [[NSString alloc] init];
//@""
NSLog(
@"str7 retainCount = %li", str7.retainCount);
NSLog(@"str6 = %p str7 = %p", str6, str7);
NSString *str8 = [str7 stringByAppendingString:
@"qian feng"];
NSLog(@"str8 retainCount = %li", str8.retainCount);
NSLog(@"str8 = %p", str8);
[str6 release];
[str7 release];
[mulStr1 release];
[mulStr2 release];
}
return 0;
}
转载于:https://www.cnblogs.com/0515offer/p/4586969.html
