NSString *stripped = [unstripped stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"\n\t "]];
Well, Cocoa, a bit of too much syntactic nutrasweet here. Take a look at PHP and wheep:
$stripped = trim($unstripped);
(Yes, I am aware that’s somewhat of an unfair comparion, but still…)
From NSData to NSString:
NSString *s = [[NSString alloc] initWithData:d encoding:NSUTF8StringEncoding];
And the other way round:
NSData *d = [s dataUsingEncoding:NSUTF8StringEncoding]:
Using NSStringFromSelector to convert the selectos into a NSString, and the print the object:
NSLog(@"%@", NSStringFromSelector(selector) );
Or print it directly with good, old-fashioned C:
NSLog(@"%s", selector,);
int x = 11; [NSString stringWithFormat:@"%03i", x]; // @"011" [NSString stringWithFormat:@"%+5i", x]; // @"+++11" [NSString stringWithFormat:@"%+05i", x]; // @"+0011"
And not really like that. 381. I’ll still have to learn a lot of C.
NSString *host = @"myhost"; NSString *videoFile = @"myVideoFileName.m4v"; NSURL *videoURL = [NSURL urlWithString[host stringByAppendingPathComponent videoFile]; MPMoviePlayerController *movie = [[MPMoviePlayerController alloc] initWithContentURL: videoURL];
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.
Update: Of course, there’s a better way. 452
float f = 1.23456; NSLog(@"%.2f", f); NSLog(@"%.0f", f); NSLog(@"%.0f", f);
1.23
1
1.23456
Works with:
NSDictionary NSArray NSData NSString
For 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); // aMutableStringandAnAppendedString
NString 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…