iOS模拟器崩溃而真实设备没有崩溃

Question

I work on a project that includes several libraries integrated as pods by Cocoapods - it has been a while but I think this error came up first when I integrated Cocoapods and hasn't disappeared ever since (so I started to use a real device for testing my builds).

Like I mentioned, I have no problems building on any real device but I constantly face the following error when building on the iOS simulator. Xcode completes the build successfully and starts up the simulator which then crashes as soon as it tries to load the build.

dyld: Symbol not found: _ACAccountTypeIdentifierTwitter
  Referenced from: .../Library/Developer/CoreSimulator/Devices/28482AD6-B0F2-4FBF-B525-C1EA3F2E07FA/data/Containers/Bundle/Application/D9992D1D-FE14-4403-A9DC-E5C1BB787E9E/projectName.app/projectName
  Expected in: flat namespace
 in .../Library/Developer/CoreSimulator/Devices/28482AD6-B0F2-4FBF-B525-C1EA3F2E07FA/data/Containers/Bundle/Application/D9992D1D-FE14-4403-A9DC-E5C1BB787E9E/projectName.app/projectName
(lldb)

I got cautious with changing linking options because when I faced this problem first, it affected also the building of Xcode itself which then failed again and again because of some difficult-for-me-to-understand errors. Furthermore I don't make use of any Twitter specific code, it just seems to be part of an integrated library.

Any help is highly appreciate as I'd very much like to be able to build on the simulator again!

EDIT 1

EDIT 2

dyld`_dyld_start:
    0x7fff6431d000 <+0>:   popq   %rdi
    0x7fff6431d001 <+1>:   pushq  $0x0
    0x7fff6431d003 <+3>:   movq   %rsp, %rbp
    0x7fff6431d006 <+6>:   andq   $-0x10, %rsp
    0x7fff6431d00a <+10>:  subq   $0x10, %rsp
    0x7fff6431d00e <+14>:  movl   0x8(%rbp), %esi
    0x7fff6431d011 <+17>:  leaq   0x10(%rbp), %rdx
    0x7fff6431d015 <+21>:  movq   0x37aec(%rip), %r8        ;     _dyld_start_static
    0x7fff6431d01c <+28>:  leaq   -0x23(%rip), %rcx         ; <+0>
    0x7fff6431d023 <+35>:  subq   %r8, %rcx
    0x7fff6431d026 <+38>:  leaq   -0x102d(%rip), %r8
    0x7fff6431d02d <+45>:  leaq   -0x8(%rbp), %r9
    0x7fff6431d031 <+49>:  callq  0x7fff6431d076            ;     dyldbootstrap::start(macho_header const*, int, char const**, long, macho_header const*, unsigned long*)
->  0x7fff6431d036 <+54>:  movq   -0x8(%rbp), %rdi
    0x7fff6431d03a <+58>:  cmpq   $0x0, %rdi
    0x7fff6431d03e <+62>:  jne    0x7fff6431d050            ; <+80>
    0x7fff6431d040 <+64>:  movq   %rbp, %rsp
    0x7fff6431d043 <+67>:  addq   $0x8, %rsp
    0x7fff6431d047 <+71>:  movq   $0x0, %rbp
    0x7fff6431d04e <+78>:  jmpq   *%rax
    0x7fff6431d050 <+80>:  addq   $0x10, %rsp
    0x7fff6431d054 <+84>:  pushq  %rdi
    0x7fff6431d055 <+85>:  movq   0x8(%rbp), %rdi
    0x7fff6431d059 <+89>:  leaq   0x10(%rbp), %rsi
    0x7fff6431d05d <+93>:  leaq   0x8(%rsi,%rdi,8), %rdx
    0x7fff6431d062 <+98>:  movq   %rdx, %rcx
    0x7fff6431d065 <+101>: movq   (%rcx), %r8
    0x7fff6431d068 <+104>: addq   $0x8, %rcx
    0x7fff6431d06c <+108>: testq  %r8, %r8
    0x7fff6431d06f <+111>: jne    0x7fff6431d065            ; <+101>
    0x7fff6431d071 <+113>: jmpq   *%rax
    0x7fff6431d073 <+115>: nop

Answer 1

Unfortunately, the iOS simulator does not fully support twitter accounts. Your phone does. The crash you're getting is for missing the _ACAccountTypeIdentifierTwitter . If you want to make sure that does not happen on the simulator, wherever you're checking for ACAccountType , check to make sure that ACAccountTypeIdentifierTwitter is available. Same for facebook, SinaWeibo, and TencentWeibo.

Answer 2

Obj-C

You need to import both Twitter and Accounts frameworks.

Swift

The entire project below compiles, builds, links and runs on the iOS Simulator. If you follow these instructions, you can verify in no time the integrity of your development environment.

Project

Xcode > New > Project... > Single View Application , SO-Twitter , Swift, Universal, Next, Create.

---

Code

import UIKit
import Twitter
import Accounts

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        let accountStore = ACAccountStore()
        let accountType = accountStore.accountTypeWithAccountTypeIdentifier(
            ACAccountTypeIdentifierTwitter)

        accountStore.requestAccessToAccountsWithType(accountType, options: nil) {(
            granted:Bool, error:NSError!) -> Void in
                println("granted:\(granted) error:\(error)"
        )}
    }
}

Above code posted on Github for convenience.

---

Link, build, run on iOS Simulator

(Verified as far back as Xcode 6.3.2 on Simulator 8.3)

granted:true error:nil

Once OK it tapped, you likely need to iOS Simulator > Reset Content and Settings... > Reset .

Answer 3

Don't use -undefined dynamic_lookup. That is causing you to hit the failure at runtime instead of getting a more obvious and helpful error at link time. If you remove that from LDFLAGS, you'll likely see an error message about not being able to resolve the _ACAccountTypeIdentifierTwitter symbol and where it's being used.

_ACAccountTypeIdentifierTwitter is provided by Accounts.framework:

$ nm $(xcrun --sdk iphonesimulator --show-sdk-path)/System/Library/Frameworks/Accounts.framework/Accounts | grep _ACAccountTypeIdentifierTwitter
000000000003bdd0 S _ACAccountTypeIdentifierTwitter