用程式獲取crash日誌
第一步：新建乙個繼承自nsobject的類（xcode新建乙個空專案過程略），取名字catchcrash，在h和m檔案中寫下：
.h檔案
#import
<foundation/foundation.h
>
@inte***ce catchcrash : nsobject
void uncaughtexceptionhandler(n***ception *exception);
@end
.m檔案
#import "catchcrash.h"
@implementation catchcrash
void uncaughtexceptionhandler(n***ception *exception)
@end
第二步：新增乙個繼承自uiviewcontroller的類，取名字為testviewcontroller。
#import "catchcrash.h"
#import "testviewcontroller.h"
第四部：在testviewcontroller的xib上面新增乙個按鈕並給其新增乙個單擊事件，testviewcontroller.m檔案中有如下**：
#import "testviewcontroller.h"
@inte***ce testviewcontroller ()
@end
@implementation testviewcontroller
- (id)initwithnibname:(nsstring *)nibnameornil bundle:(nsbundle *)nibbundleornil
return self;
}
- (void)viewdidload
- (void)didreceivememorywarning
#pragma mark - 單擊事件
#pragma mark - custom method
- (void) killmemory
} @end
執行**：可以看到閃退，匯出error日誌，我們可以看到：
exception reason：nsrangeexception
<span
style
="color:#ff0000;"
>exception name：*** -[__nsarrayi objectatindex:]: index 1 beyond bounds for empty array
span>
exception stack：(
0 corefoundation 0x2f2edfeb<redacted>+ 154
1 libobjc.a.dylib 0x39b66ccf objc_exception_throw + 38
2 corefoundation 0x2f224a89<redacted>+ 176
<span
style
="color:#ff0000;"
>span>
4 uikit 0x31b3f057<redacted>+ 90
5 uikit 0x31b3eff7<redacted>+ 30
6 uikit 0x31b3efd1<redacted>+ 44
7 uikit 0x31b2a737<redacted>+ 374
8 uikit 0x31b3ea4f<redacted>+ 590
9 uikit 0x31b3e721<redacted>+ 528
10 uikit 0x31b396eb<redacted>+ 758
11 uikit 0x31b0e8ed<redacted>+ 196
12 uikit 0x31b0cf97<redacted>+ 7102
13 corefoundation 0x2f2b925b<redacted>+ 14
14 corefoundation 0x2f2b872b<redacted>+ 206
15 corefoundation 0x2f2b6f1f<redacted>+ 622
16 corefoundation 0x2f221f0f cfrunlooprunspecific + 522
17 corefoundation 0x2f221cf3 cfrunloopruninmode + 106
18 graphicsservices 0x3417a663 gseventrunmodal + 138
20 testcrash 0x000e810d main + 116
21 libdyld.dylib 0x3a073ab7<redacted>+ 2 )
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