The age-old problem. Files, that are stored with padded zeros 000, 001, 002, 003 – and a counter that doesn’t have this zero-padding. There are probably myriad solution to that problem, here’s my take:
Create a temporary string consisting of a minimum of 3 characters length.
NSString *tempZeros = [NSString stringWithFormat:@"00%i", i];Get the last 3 characters, shave off the rest.
NSString *zeroPaddedIndex = [tempZeros substringFromIndex:[tempZeros length] - 3];No if's, no but's, no clauses.
float f = 1.23456;
NSLog(@"%.2f", f);
NSLog(@"%.0f", f);
NSLog(@"%.0f", f);1.23
1
1.23456
Works with:
NSDictionary
NSArray
NSData
NSStringFor more complicated purposes, NSOutputStream might be the best option, but for simply writing a date or even XML this might be the simplest and fasted way.
Should have been clear, but was not:
NSString *s = @"aString";
s = @"anotherString";
NSLog(@"%@", s);
// anotherString
NSMutableString *m = @"aMutableString";
[m appendString:@"andAnAppendedString"];
NSLog(@"%@", m);
// aMutableStringandAnAppendedStringNString allows for the replacement of its whole content by simply assigning a new value.
With NSMutableString it is possible to add/delete/insert strings at arbitrary places in a string.
NSMutableString *s;
…
-(void)functionA:(NSString *)string {
[self.s appendString: string];
}
-(void)functionB:(NSString *)string {
NSString* c = self.s;
NSString* c = [NSString stringWithString: self.s];
}
“Returns a string created by copying the characters from another given string.”
self.s is a refernce to s, might change over time, stringWithString makes a copy, a “snapshot” of self.s…
That’s basically it.
No more
[@"string1" stringByAppendingString:@"string2"];
or
[NSString stringWithFormat:@"string1%@", @"string1"];
just
@"string1" @"string2" @"stringN" -> @"string1string2stringN"