[NSString stringByAppendingString]
Returns a new string made by appending a given string to the receiver.
- (NSString *)stringByAppendingString:(NSString *)aString
Parameters
- aString
- The string to append to the receiver. This value must not be
nil
.
Return Value
A new string made by appending aString to the receiver.
Discussion of [NSString stringByAppendingString]
This code excerpt, for example:
NSString *errorTag = @"Error: ";
|
NSString *errorString = @"premature end of file.";
|
NSString *errorMessage = [errorTag stringByAppendingString: errorString];
|
produces the string “
Error: premature end of file.
”.
Example of [NSString stringByAppendingString]
// creates an autoreleased string
fullCmdString = [NSString stringWithString:[inStr stringByAppendingString:add]];
// also creates an autoreleased string
fullCmdString = [inStr stringByAppendingString:add];
// works great, not an autoreleased string
fullCmdString = @"basic text text added";
Example of [NSString stringByAppendingString]
// OK! Avoid the autorelease pool (at least, for fullCmdString)
fullCmdString = [[NSString alloc] initWithString:[inStr stringByAppendingString:add]];
// also OK! It's in the pool, but it's also been retained.
fullCmdString = [[inStr stringByAppendingString:add] retain];
// also OK
fullCmdString = @"basic text text added";
Example of [NSString stringByAppendingString]
+ (NSString *)descriptionOfTopOfStack:(NSMutableArray *)stack
{
NSLog(@"stack array :: %@",stack);
NSString *result;
NSString *displayString = [[NSString alloc]init];
id topOfStack = [stack lastObject];
if (topOfStack) [stack removeLastObject];
NSLog(@"topOfStack :: %@", (NSString*)topOfStack);
if ([self isNoOperandOperation:topOfStack]) {
displayString = [[(NSNumber*)displayString stringValue]
stringByAppendingString:(NSString*)topStack];
result = displayString;
}
else if ([self isOperation:topOfStack]){
id nextInStack = [stack lastObject];
if (topOfStack) [stack removeLastObject];
displayString = [[(NSNumber*)displayString stringValue]
stringByAppendingString:(NSString*)nextInStack];
displayString = [[(NSNumber*) displayString stringValue]
stringByAppendingString:(NSString*)topStack];
result = displayString;