Objective-c的Foundation中惯用类2——NSString和NSMutableString

Objective-c的Foundation中常用类2——NSString和NSMutableString

继续NSString,由于用的多，所以应该重点掌握

1、求字符串长度

NSRange range2 = [str7 rangeOfString:@"have"];        NSRange range3 = [str7 rangeOfString:@"aaa"];                NSLog(@"location1...%ld",range2.location);        NSLog(@"location2...%ld",range3.location);

location1...4

location2...9223372036854775807

NSMutableString的相关用法