我想在地图上显示特定地址。这是我的代码。
- (void)viewDidLoad{
[super viewDidLoad];
CLLocationCoordinate2D startCoord = CLLocationCoordinate2DMake(51.514302, 7.616798);
MKCoordinateRegion adjustedRegion = [_map regionThatFits:MKCoordinateRegionMakeWithDistance(startCoord, 200.0, 200.0)];
adjustedRegion.span = MKCoordinateSpanMake(0.005, 0.005);
[_map setRegion:adjustedRegion];
在模拟器上它工作正常，但在我的iPad上它崩溃了...... 我的错在哪里？
Last Exception Backtrace:
0 CoreFoundation 0x33cbe3e2 __exceptionPreprocess + 158
1 libobjc.A.dylib 0x3bb4e95e objc_exception_throw + 26
2 CoreFoundation 0x33cbe0d0 -[NSException raise] + 4
3 MapKit 0x34aec530 -[MKMapView setRegion:animated:] + 672
4 MapKit 0x34aec64a __32-[MKMapView setRegion:animated:]_block_invoke_0 + 90
5 MapKit 0x34ad6006 -[MKMapView _updateCenteredAttributesWithCoordinate:] + 122
6 MapKit 0x34ad5f3a -[MKMapView _sizeDidChangeWithCenterCoordinate:] + 126
7 MapKit 0x34ae8b58 -[MKMapView setBounds:] + 224
8 UIKit 0x35cb2476 -[UIView(Geometry) _applyISEngineLayoutValues] + 246
9 UIKit 0x35b3068a -[UIView(Geometry) _resizeWithOldSuperviewSize:] + 138
10 CoreFoundation 0x33cb9c1c __NSArrayChunkIterate + 364
11 CoreFoundation 0x33cb2bb2 __NSArrayEnumerate + 590
12 CoreFoundation 0x33c14e32 -[NSArray enumerateObjectsWithOptions:usingBlock:] + 58
13 UIKit 0x35ae9096 -[UIView(Geometry) resizeSubviewsWithOldSize:] + 114
14 UIKit 0x35f09da8 -[UIView(AdditionalLayoutSupport) _is_layout] + 112
15 UIKit 0x35ad6ae0 -[UIView(Hierarchy) layoutSubviews] + 68
16 UIKit 0x35ad08c2 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 254
17 QuartzCore 0x3587c50e -[CALayer layoutSublayers] + 210
18 QuartzCore 0x3587c0b0 CA::Layer::layout_if_needed(CA::Transaction*) + 456
19 QuartzCore 0x358aaeca -[CALayer layoutIfNeeded] + 138
20 UIKit 0x35b7a0dc -[UIViewController window:setupWithInterfaceOrientation:] + 204
21 UIKit 0x35b792c6 -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:isRotating:] + 3598
22 UIKit 0x35b784aa -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:] + 42
23 UIKit 0x35b78434 -[UIWindow _setRotatableViewOrientation:duration:force:] + 64
24 UIKit 0x35cadcb4 __57-[UIWindow _updateToInterfaceOrientation:duration:force:]_block_invoke_0 + 100
25 UIKit 0x35b3667e -[UIWindow _updateToInterfaceOrientation:duration:force:] + 214
26 UIKit 0x35b363c2 -[UIWindow setAutorotates:forceUpdateInterfaceOrientation:] + 690
27 UIKit 0x35b35d2a -[UIViewController _tryBecomeRootViewControllerInWindow:] + 150
28 UIKit 0x35b2ce86 -[UIWindow addRootViewControllerViewIfPossible] + 366
29 UIKit 0x35b28af0 -[UIWindow _setHidden:forced:] + 360
30 UIKit 0x35b6a1dc -[UIWindow makeKeyAndVisible] + 56
31 UIKit 0x35b2d7fe -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1642
32 UIKit 0x35b2582e -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 694
33 UIKit 0x35acdd1a -[UIApplication handleEvent:withNewEvent:] + 1006
34 UIKit 0x35acd7a8 -[UIApplication sendEvent:] + 68
35 UIKit 0x35acd1ea _UIApplicationHandleEvent + 6194
36 GraphicsServices 0x377c05f2 _PurpleEventCallback + 586
37 GraphicsServices 0x377c0222 PurpleEventCallback + 30
38 CoreFoundation 0x33c933e2 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 30
39 CoreFoundation 0x33c93386 __CFRunLoopDoSource1 + 134
40 CoreFoundation 0x33c9220a __CFRunLoopRun + 1378
41 CoreFoundation 0x33c05238 CFRunLoopRunSpecific + 352
42 CoreFoundation 0x33c050c4 CFRunLoopRunInMode + 100
43 UIKit 0x35b24468 -[UIApplication _run] + 664
44 UIKit 0x35b212b4 UIApplicationMain + 1116
45 AD HOK 0x000bcd80 main (main.m:16)
46 libdyld.dylib 0x3bf7bb1c start + 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x3c042350 __pthread_kill + 8
1 libsystem_c.dylib 0x3bfb8fb2 pthread_kill + 54
2 libsystem_c.dylib 0x3bff5366 abort + 90
3 libc++abi.dylib 0x3b59ddda abort_message + 70
4 libc++abi.dylib 0x3b59b094 _ZL17default_terminatev + 20
5 libobjc.A.dylib 0x3bb4ea58 _ZL15_objc_terminatev + 144
6 libc++abi.dylib 0x3b59b118 _ZL19safe_handler_callerPFvvE + 76
7 libc++abi.dylib 0x3b59b1b0 std::terminate() + 16
8 libc++abi.dylib 0x3b59c626 __cxa_rethrow + 90
9 libobjc.A.dylib 0x3bb4e9b0 objc_exception_rethrow + 8
10 CoreFoundation 0x33c0529c CFRunLoopRunSpecific + 452
11 CoreFoundation 0x33c050c4 CFRunLoopRunInMode + 100
12 UIKit 0x35b24468 -[UIApplication _run] + 664
13 UIKit 0x35b212b4 UIApplicationMain + 1116
14 AD HOK 0x000bcd80 main (main.m:16)
15 libdyld.dylib 0x3bf7bb1c start + 0
Thread 1:
0 libsystem_kernel.dylib 0x3c042d98 __workq_kernreturn + 8
1 libsystem_c.dylib 0x3bf90ad6 _pthread_workq_return + 14
2 libsystem_c.dylib 0x3bf907f2 _pthread_wqthread + 362
3 libsystem_c.dylib 0x3bf90680 start_wqthread + 4
Thread 2 name: Dispatch queue: com.apple.libdispatch-manager
Thread 2:
0 libsystem_kernel.dylib 0x3c0325d0 kevent64 + 24
1 libdispatch.dylib 0x3bf6dd22 _dispatch_mgr_invoke + 806
2 libdispatch.dylib 0x3bf69374 _dispatch_mgr_thread + 32
Thread 3:
0 libsystem_kernel.dylib 0x3c042d98 __workq_kernreturn + 8
1 libsystem_c.dylib 0x3bf90ad6 _pthread_workq_return + 14
2 libsystem_c.dylib 0x3bf907f2 _pthread_wqthread + 362
3 libsystem_c.dylib 0x3bf90680 start_wqthread + 4
Thread 4 name: WebThread
Thread 4:
0 libsystem_kernel.dylib 0x3c031e30 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3c031fd0 mach_msg + 48
2 CoreFoundation 0x33c932b6 __CFRunLoopServiceMachPort + 126
3 CoreFoundation 0x33c9202c __CFRunLoopRun + 900
4 CoreFoundation 0x33c05238 CFRunLoopRunSpecific + 352
5 CoreFoundation 0x33c050c4 CFRunLoopRunInMode + 100
6 WebCore 0x39be0390 _ZL12RunWebThreadPv + 440
7 libsystem_c.dylib 0x3bf9b0de _pthread_start + 306
8 libsystem_c.dylib 0x3bf9afa4 thread_start + 4
Thread 5:
0 libsystem_kernel.dylib 0x3c042d98 __workq_kernreturn + 8
1 libsystem_c.dylib 0x3bf90ad6 _pthread_workq_return + 14
2 libsystem_c.dylib 0x3bf907f2 _pthread_wqthread + 362
3 libsystem_c.dylib 0x3bf90680 start_wqthread + 4
Thread 0 crashed with ARM Thread State (32-bit):
r0: 0x00000000 r1: 0x00000000 r2: 0x00000000 r3: 0x3db31524
r4: 0x00000006 r5: 0x3db31b78 r6: 0x210aa354 r7: 0x2fd459d4
r8: 0x210aa330 r9: 0x00000300 r10: 0x00000000 r11: 0x7ff80000
ip: 0x00000148 sp: 0x2fd459c8 lr: 0x3bfb8fb7 pc: 0x3c042350
cpsr: 0x00000010
答案 0 :(得分：4)
目前还不清楚为什么要向地图询问适合的区域，最后再次明确地再次设置该区域的范围。此外，在布局完成之前，地图对此问题没有有意义的答案。这可能是它崩溃的原因，因为该区域未正确定义。
从您的代码中看起来您只是想这样做：
- (void)viewDidLoad{
[super viewDidLoad];
CLLocationCoordinate2D startCoord = CLLocationCoordinate2DMake(51.514302, 7.616798);
[_map setRegion:MKCoordinateRegionMakeWithDistance(startCoord, 200.0, 200.0) animated:NO];
}
我认为这更简单，并且应该在设备上正常工作。希望有所帮助。