[NSString hasPrefix]
Returns a Boolean value that indicates whether a given string matches the beginning characters of the receiver.
- (BOOL)hasPrefix:(NSString *)aString
Parameters
- aString
- A string.
Return Value of [NSString hasPrefix]
YES if aString matches the beginning characters of the receiver, otherwise NO. Returns NO if aString is empty.Discussion of [NSString hasPrefix]
This method is a convenience for comparing strings using the
NSAnchoredSearch option. See String Programming Guide for more information.
Example of [NSString hasPrefix]
NSString *myURLString = @"www.google.com";
NSURL *myURL;
if ([myURLString hasPrefix:@"http://"]) {
myURL = [NSURL URLWithString:myURLString];
} else {
myURL = [NSURL URLWithString:[NSString StringWithFormat:@"http://%@",myURLString]];
}
Example of [NSString hasPrefix]
NSString* output = nil;
if([string hasPrefix:@"*"])
output = [string substringFromIndex:1];
Example of [NSString hasPrefix]
NSArray *allStringsArray =
[myStringThatHasHttpUrls componentsSeparatedByString:@" "]
for (id myArrayElement in allStringsArray) {
NSString *theString = [myArrayElement description];
if ([theString hasPrefix:@"http"]) {
NSLog(@"The URL is %@", [myArrayElement description]);
}
}