Is there a way to pass command line options to my iOS app from Xcode?
I'm hoping to find a method to pass certain information in to my app when 开发者_Python百科I launch it during testing, so that I can perform special debug tasks. Xcode has a section "Arguments Passed on Launch", and I assumed they would show up in my UIApplicationDelegate's application:didFinishLaunchingWithOptions: but the dictionary that's passed in is always nil.
Am I going about this the wrong way?
You can access them using NSProcessInfo
object like this,
NSArray * arguments = [[NSProcessInfo processInfo] arguments];
Another easier way is to use the NSUserDefaults.
http://perspx.com/archives/parsing-command-line-arguments-nsuserdefaults/
From the article:
Command line arguments that can be parsed and used by the
NSArgumentDomain
must take the format:-name value
The argument is stored as a default with key of
name
and value ofvalue
. At this point accessing values passed in on the command line is the same process for accessing any other defaults.For example running an application as such:
MyApplication -aString "Hello, World" -anInteger 10
allows the command line arguments to be retrieved as such:
NSUserDefaults *standardDefaults = [NSUserDefaults standardUserDefaults]; NSString *aString = [standardDefaults stringForKey:@"aString"]; NSInteger anInteger = [standardDefaults integerForKey:@"anInteger"];
For those who stumbled to this question like me :)
I wanted to have a logLevel
for my static lib. The way I did is,
static NSUInteger logLevel = 1;
/** This argument should be passed from XCode's build scheme configuration option, Arguments passed on launch */
static const NSString *kIdcLogLevelArgument = @"-com.mycompany.IDCLogLevel";
@implementation IDCLogger
+ (instancetype)sharedInstance {
static id sharedInstance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedInstance = [[self alloc] init];
});
return sharedInstance;
}
+(void)initialize
{
logLevel = 1;
NSArray *arguments = [[NSProcessInfo processInfo] arguments];
NSUInteger value = 0;
if ([arguments containsObject:kIdcLogLevelArgument]) {
NSUInteger index = [arguments indexOfObject:kIdcLogLevelArgument];
if (arguments.count > index) {
NSString *valueStr = [arguments objectAtIndex:index + 1];
NSCharacterSet* notDigits = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
if ([valueStr rangeOfCharacterFromSet:notDigits].location == NSNotFound)
{
value = [valueStr integerValue];
logLevel = value;
}
}
}
NSLog(@"%@:logLevel = %lu", [self class], (unsigned long)logLevel);
}
+ (void)setLogLevel:(NSUInteger)l
{
logLevel = l;
NSLog(@"[%@]: Log level set to: %lu", [self class], (unsigned long)l);
}
In addition to scalars, command line arguments can be an NSData, NSArray, or NSDictionary references. Apple's documentation on "Old-Style ASCII Property Lists" tells how to do it. https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/PropertyLists/OldStylePlists/OldStylePLists.html#//apple_ref/doc/uid/20001012-BBCBDBJE
For example, this syntax should decode into an NSDictionary:
MyApplication -aLocation "{ latitude = 37.40089; longitude = -122.109428; }"
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