You can “trim” the text, that is remove all the whitespace at the start and end. If all that’s left is an empty string, then only whitespace (or nothing) was entered. NSString *rawString = [textField text]; NSCharacterSet *whitespace = [NSCharacterSet whitespaceAndNewlineCharacterSet]; NSString *trimmed = [rawString stringByTrimmingCharactersInSet:whitespace]; if ([trimmed length] == 0) { // Text was … Read more
You can “trim” the text, that is remove all the whitespace at the start and end. If all that’s left is an empty string, then only whitespace (or nothing) was entered. NSString *rawString = [textField text]; NSCharacterSet *whitespace = [NSCharacterSet whitespaceAndNewlineCharacterSet]; NSString *trimmed = [rawString stringByTrimmingCharactersInSet:whitespace]; if ([trimmed length] == 0) { // Text was … Read more
You should be able to use any of those fonts, provided you know the appropriate name. There are calls to enumerate the font families and individual fonts in those families on the phone, but a complete listing is available on this site.
You could create an image programmatically and so have the ability to use your colors in a dynamic way: Create a category for UIButton with this method and be sure to have QuartzCore lib imported via @import QuartzCore: – (void)setColor:(UIColor *)color forState:(UIControlState)state { UIView *colorView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1, 1)]; colorView.backgroundColor = color; … Read more
Yes. Stop using the synchronous API. If you use the asynchronous delegate-based API then you have a lot more control over the connection. With this API, except in cases where an error is encountered before the HTTP header is received, you will always receive -connection:didReceiveResponse:, which gives you access to the HTTP header fields (encapsulated … Read more
__NSArrayI is a code-word for an immutable array – that is, a “regular” NSArray which you cannot change. __NSArrayM is a code-word for a mutable array – that is, NSMutableArray. In NSMutableArray, you can add and remove items.
According to this solution https://devforums.apple.com/message/612098#612098 make this steps: Install ApplicationLoader_2.5.1.dmg (Just install it, you don’t need to launch/use it) Quit & restart Xcode Clean Project Archive (again) Validate/Submit now works This solution fixed my problems with submission.
When you use NSPrivateQueueConcurrencyType you need to do anything that touches that context or any object belonging to that context inside the -performBlock: method. Your code above is illegal since you’re passing those objects back to the main queue. The new API helps you in solving this, though: You create one context that’s associated with … Read more
Hm, try to look at the NSValue at https://developer.apple.com/documentation/foundation/nsvalue You can use it like struct aStruct { int a; int b; }; typedef struct aStruct aStruct; Then sort of “wrap” it to an NSValue object like: aStruct struct; struct.a = 0; struct.b = 0; NSValue *anObj = [NSValue value:&struct withObjCType:@encode(aStruct)]; NSArray *array = @[anObj]; To … Read more
Sqlite3 is more useful for keeping large database and to access to the database elements. You can sort the items of Sqlite3 database, you can search very fast for item in Sqlite3 dtabase. Sqlite3 database has many privileges that NSUserDefaults didn’t have ! NSUserDefaults vs Sqlite3 NSUserDefaults is for user preferences, usually basic objects like … Read more