一:多线程概念知识:
![A956AA5B-F085-4102-8B6A-67277CE92968.png](https://img.haomeiwen.com/i2121311/ea2ff49922263c17.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240) 89C5BA98-AF16-4504-9D8E-550E3DC813CC.png 7A2F8EB8-5EE0-4045-A52C-A9F39EF4283F.png EEC509E9-0F58-4B63-BE4B-88274259BE40.png
二,NSThread 的使用场景
(1)耗时操作放在子线程中执行
三.多线程安全
![8995934D-EAAE-42DE-9F3E-FEADCAED8CFD.png](https://img.haomeiwen.com/i2121311/44322e9fb772005f.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240) AE8FA91F-A7AF-4D4E-9CFF-36B90B6C72F8.png5CD00685-931B-4EAD-AD32-98316479BFDA.png
四.GCD
C3AD684E-52A3-4C1F-9844-F70146D527E7.png F8C06DBF-1EF5-4FFE-8322-1BD405B5AFBD.png 81502972-C387-4963-A0BA-233DB45C8CDA.png C9E1B511-9705-4BDF-9C8C-24E38DDDA321.png 94C24778-3B68-4395-B70B-214BBFAF69B0.png 53F4AD79-F5EE-4C07-9645-2AE3D76B01B2.png 1A175733-6E09-443C-BDD7-494C10B162AD.png 01298948-2B51-47C7-9934-6359E1C2D567.png 3D75F4EE-DE4B-431B-86AE-2E51F4CB9502.png 379500A3-D377-4FFD-8868-7DE0F548FC18.png 264E9606-E7E0-45A0-85A3-797D4D69A120.png 8ADDB6FA-1B25-45DB-946A-18BC21119D24.png 56313C87-F994-4230-AF25-391BB2BC185C.png五:NSOpreation
4BEE93D1-566A-4506-BBFB-4B49BC10E98D.png 1FF4B988-AFA7-4BD4-A533-62DD5583EF29.png 8B890776-FD19-4536-92AA-B44EC63C84F1.png 60072AC2-E2DC-44DB-9A2B-C06587999C4F.png 7D8A9A32-67F8-43CA-93A2-29F6C261C9DC.png 56ACA2F7-28B0-402D-A182-84A9D42D8640.png
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