比如__bridge，block的内存管理，而且会针对一个问题拓展问，考察你是真的了解还是直接背准备好的。手写C或者OC代码是一定有的，而且都比较重视，因为这是考察你的基础是否牢固，常见的手写单例，setter getter，快排都是经常问的。
面试说UITableView滑动卡的问题，让优化，我回答 FB开源的那套渲染排版分离到分线程
又让设计一个图片下载器
Block,多线程。
问了些单例模式，为什么苹果推荐的写法，不用可以吗？问了些循环引用的问题。
总结:
-
__bridge
https://blog.csdn.net/u010130947/article/details/44493931 -
block的内存管理
http://www.cocoachina.com/ios/20161025/17198.html
https://blog.csdn.net/cloudox_/article/details/70157717
https://blog.csdn.net/u012526801/article/details/49281893
https://blog.csdn.net/u012526801/article/details/49281893
block 3种,全局block 代码区,栈block 和堆block
ARC 只用全局和堆,系统自动将栈复制到对上,不引用外部变量的为全局,引用以后为堆
用strong或copy 修饰,因为堆内存一直在变有可能被释放
__block 修改外部变量是修饰,可以将外部变量存入结构体,捕获的是指针 可以修改
__weak 循环引用 weakself block里面在strong一下 原因有2 怕释放self,和__weak对象每使用一次就会加入一次autoreleasepool 中一次 频繁使用会造成内存溢出
3.手写单例，
#import "SingletonVC.h"
// 创建静态对象 防止外部访问
static SingletonVC * _singletonVC;
@implementation SingletonVC
+ (instancetype)allocWithZone:(struct _NSZone *)zone{
static dispatch_once_t onceToken;
// 一次函数
dispatch_once(&onceToken, ^{
if (_singletonVC == nil) {
_singletonVC = [super allocWithZone:zone];
}
});
return _singletonVC;
}
+ (instancetype)share{
return [[self alloc] init];
}
@end
#import "SingletonVC.h"
// 创建静态对象 防止外部访问
static SingletonVC * _singletonVC;
@implementation SingletonVC
+ (instancetype)allocWithZone:(struct _NSZone *)zone{
//线程锁
@synchronized (self) {
if (_singletonVC == nil) {
_singletonVC = [super allocWithZone:zone];
}
}
return _singletonVC;
}
+ (instancetype)share{
return [[self alloc] init];
}
@end
单利的优缺点以及详细讲解
https://www.jianshu.com/p/4867dc92337e
不要滥用单例
http://wiki.jikexueyuan.com/project/objc/architecture/13-2.html
setter getter，
https://www.jianshu.com/p/90a7b27c781a
快排
https://www.jianshu.com/p/34e920acfe1c
https://www.jianshu.com/p/28928b74fe48
字符串逆序
- (NSString *)stringByReversed
{
NSMutableString *s = [NSMutableString string];
for (NSUInteger i=self.length; i>0; i--) {
[s appendString:[self substringWithRange:NSMakeRange(i-1, 1)]];
}
return s;
}
https://segmentfault.com/q/1010000000181923
1、实现一个字符串“how are you”的逆序输出（编程语言不限）。如给定字符串为“hello world”,输出结果应当为“world hello”。(字符串逆序输出、二叉树、归并排序)
https://blog.csdn.net/shihuboke/article/details/77145615
c语言逆序(中间切断两边交换,类似快排)
main()
{
int i,j,t,n;
char a[10];
printf("请输入字符串:");
gets(a);
n=strlen(a);
for(i=0;i<=n/2;i++)
{
t=a[i];
a[i]=a[n-1-i];
a[n-1-i]=t;
}
for(j=0;j<n;j++)
printf("%c",a[j]);
printf("\n");
}
递归逆序字符串
https://blog.csdn.net/u012978932/article/details/46929177
/*
* reverse string via the terminating zero
*/
void foo1(char* a) {
int len = strlen(a);
int i;
for (i = 0; i < len / 2; i++) {
a[len] = a[i];
a[i] = a[len - i - 1];
a[len - i - 1] = a[len];
}
a[len] = 0;
}
/*
* reverse string via a temp variable
*/
void foo2(char* a) {
char temp;
int len = strlen(a);
int i;
for (i = 0; i < len / 2; i++) {
temp = a[i];
a[i] = a[len - i - 1];
a[len - i - 1] = temp;
}
}
/*
* reverse string via XORs
*/
void foo3(char* a) {
int len = strlen(a);
int i;
for (i = 0; i < len / 2; i++) {
a[len - i - 1] ^= a[i];
a[i] ^= a[len - i - 1];
a[len - i - 1] ^= a[i];
}
}
http://rednaxelafx.iteye.com/blog/134002/
4.UITableView滑动卡的问题
https://bestswifter.com/uikitxing-neng-diao-you-shi-zhan-jiang-jie/
https://blog.csdn.net/happyfish2015/article/details/48146287
http://blog.sunnyxx.com/2015/05/17/cell-height-calculation/
https://blog.csdn.net/qq_23616601/article/details/51038263
5.设计一个图片下载器
https://www.jianshu.com/p/4f50db93e7b6
https://www.jianshu.com/p/b7a1a6e2ee4c
6.多线程
https://www.jianshu.com/p/266bec7c4dd2
sdwebimage
https://blog.csdn.net/Maxdong24/article/details/53735205
7,week
http://www.cocoachina.com/ios/20170328/18962.html
百度面试
http://www.cocoachina.com/ios/20171127/21331.html
//需要详细阅读 各种面试总结
https://blog.csdn.net/u013125233/article/details/51063569
yytext
https://github.com/lzwjava/OpenSourceNotes/blob/master/YYText/YYText.md
https://www.jianshu.com/p/e214b3793005
https://www.jianshu.com/p/74fdd28b0a09
微博 采访
http://blog.sina.com.cn/s/blog_68147f680102weti.html
http://mp.weixin.qq.com/s?__biz=MzUxMzcxMzE5Ng==&mid=2247488452&idx=1&sn=0de45a93e355a2700b04b328b042c47a&source=41#wechat_redirect
https://blog.csdn.net/ahut_qyb_6737/article/details/40891683
https://www.cnblogs.com/ioriwellings/p/5011993.html
https://www.cnblogs.com/ioriwellings/p/5011993.html
异步
https://blog.csdn.net/game3108/article/details/53023941
https://www.jianshu.com/p/e2c5b2bab063
https://zhuanlan.zhihu.com/p/25371361?from=groupmessage&isappinstalled=0
星光社性能优化
http://www.starming.com/2017/06/20/deeply-ios-performance-optimization/#more
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