首先我们整理常常会闪退的异常哪些:数组越界、空引用、引用没有定义方法、内存空间不足等等。
怎样获取crash闪退日志 -- 工具查看
先看第一个问题怎样查看,我搜索的方法有下面几个:
第一个方法:XCode 的菜单Window->Organizer 选择Devices -> 选中的手机 -> 点击手机名称左边的箭头 会等到例如以下图
注意对照一下红色框框内容,这个日志也基本上上告诉你crash的原因了。
另外一种方法 打开手机 - > 设置 -> 隐私 - > 诊断与用量 - > 诊断与用量数据 这里面就是全部应用的Crash日志。
第三种方法 通过iTunes Connect(Manage Your Applications - View Details - Crash Reports)获取用户的crash日志。方法非常多这里不多列了。
解析crash
參见:http://stackoverflow.com/questions/1460892/symbolicating-iphone-app-crash-reports )
用程序获取crash日志
可是这里都是工具,没实用到程序获取,经过千方百计的查询(思路是:先找到存放crash的iphone系统路径:var/mobile/Library/Logs/CrashReporter)找到了crash存放的路径。唉,苦于无法读取(用程序读出来都是nil)。当然假设是越狱手机就不一样是能够读取的。这个思路断掉了。
换个思路:自己用程序捕获crash。保存到本地能够吗?这么一试,果然........
第一步:新建一个继承自NSObject的类(Xcode新建一个空项目过程略),取名字CatchCrash,在h和m文件里写下:
.h文件
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#import <Foundation/Foundation.h>
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@interface CatchCrash : NSObject
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void uncaughtExceptionHandler(NSException *exception);
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@end
.m文件
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#import "CatchCrash.h"
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@implementation CatchCrash
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void uncaughtExceptionHandler(NSException *exception)
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{
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// 异常的堆栈信息
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NSArray *stackArray = [exception callStackSymbols];
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// 出现异常的原因
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NSString *reason = [exception reason];
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// 异常名称
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NSString *name = [exception name];
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NSString *exceptionInfo = [NSString stringWithFormat:@"Exception reason:%@ Exception name:%@ Exception stack:%@",name, reason, stackArray];
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NSLog(@"%@", exceptionInfo);
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NSMutableArray *tmpArr = [NSMutableArray arrayWithArray:stackArray];
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[tmpArr insertObject:reason atIndex:0];
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//保存到本地 -- 当然你能够在下次启动的时候,上传这个log
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[exceptionInfo writeToFile:[NSString stringWithFormat:@"%@/Documents/error.log",NSHomeDirectory()] atomically:YES encoding:NSUTF8StringEncoding error:nil];
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}
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@end
第二步:加入一个继承自UIViewcontroller的类,取名字为TestViewController。
第三步:注冊CatchCrash异常处理方法,在Appdelegate写下例如以下代码:
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#import "AppDelegate.h"
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#import "CatchCrash.h"
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#import "TestViewController.h"
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@implementation AppDelegate
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- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
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{
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self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
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// Override point for customization after application launch.
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//注冊消息处理函数的处理方法
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NSSetUncaughtExceptionHandler(&uncaughtExceptionHandler);
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TestViewController *testVc = [[TestViewController alloc] init];
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self.window.rootViewController = testVc;
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self.window.backgroundColor = [UIColor whiteColor];
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[self.window makeKeyAndVisible];
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return YES;
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}
第四部:在TestViewController的Xib上面加入一个button并给其加入一个单击事件。TestViewController.m文件里有例如以下代码:
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#import "TestViewController.h"
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@interface TestViewController ()
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@end
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@implementation TestViewController
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- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
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{
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self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
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if (self) {
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// Custom initialization
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}
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return self;
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}
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- (void)viewDidLoad
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{
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[super viewDidLoad];
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// Do any additional setup after loading the view from its nib.
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}
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- (void)didReceiveMemoryWarning
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{
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[super didReceiveMemoryWarning];
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// Dispose of any resources that can be recreated.
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}
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#pragma mark - 单击事件
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- (IBAction)crashTapped:(id)sender
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{
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//常见异常1---不存在方法引用
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// [self performSelector:@selector(thisMthodDoesNotExist) withObject:nil];
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//常见异常2---键值对引用nil
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// [[NSMutableDictionary dictionary] setObject:nil forKey:@"nil"];
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//常见异常3---数组越界
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[[NSArray array] objectAtIndex:1];
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//常见异常4---memory warning 级别3以上
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// [self performSelector:@selector(killMemory) withObject:nil];
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//其它大家去想吧
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}
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#pragma mark - custom method
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- (void) killMemory
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{
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for (int i = 0; i < 300; i ++)
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{
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UILabel *tmpLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 320, 200)];
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tmpLabel.layer.masksToBounds = YES;
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tmpLabel.layer.cornerRadius = 10;
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tmpLabel.backgroundColor = [UIColor redColor];
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[self.view addSubview:tmpLabel];
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}
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}
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@end
执行代码:能够看到闪退,导出error日志,我们能够看到:
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Exception reason:NSRangeException
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<span style="color:#FF0000;">Exception name:*** -[__NSArrayI objectAtIndex:]: index 1 beyond bounds for empty array</span>
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Exception stack:(
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0 CoreFoundation 0x2f2edfeb <redacted> + 154
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1 libobjc.A.dylib 0x39b66ccf objc_exception_throw + 38
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2 CoreFoundation 0x2f224a89 <redacted> + 176
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<span style="color:#FF0000;"> 3 TestCrash 0x000e8077 -[TestViewController crashTapped:] + 126</span>
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4 UIKit 0x31b3f057 <redacted> + 90
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5 UIKit 0x31b3eff7 <redacted> + 30
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6 UIKit 0x31b3efd1 <redacted> + 44
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7 UIKit 0x31b2a737 <redacted> + 374
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8 UIKit 0x31b3ea4f <redacted> + 590
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9 UIKit 0x31b3e721 <redacted> + 528
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10 UIKit 0x31b396eb <redacted> + 758
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11 UIKit 0x31b0e8ed <redacted> + 196
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12 UIKit 0x31b0cf97 <redacted> + 7102
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13 CoreFoundation 0x2f2b925b <redacted> + 14
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14 CoreFoundation 0x2f2b872b <redacted> + 206
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15 CoreFoundation 0x2f2b6f1f <redacted> + 622
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16 CoreFoundation 0x2f221f0f CFRunLoopRunSpecific + 522
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17 CoreFoundation 0x2f221cf3 CFRunLoopRunInMode + 106
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18 GraphicsServices 0x3417a663 GSEventRunModal + 138
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19 UIKit 0x31b6d16d UIApplicationMain + 1136
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20 TestCrash 0x000e810d main + 116
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21 libdyld.dylib 0x3a073ab7 <redacted> + 2
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)
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