IOS NSString intercept strings (intercepted by index)

1. rangeofstring: Intercept the length of the specified string; 2. substringToIndex:7：截取从0 索引到指定索引（7）长度的字符串 （从0到7）
3. substringFromIndex:9：截取从指定索引（9）到末尾长度的字符串  （从9到0）
4. substringWithRange:NSMakeRange（4，2）：截取从指定索引（4）到指定（2）长度的字符串 （从4开始后的2个）
5. isEqualToString:@"p://www"：比较字符串包含关系，区分大小写
6. stringWithFormat:格式化字符串。I. Define a string A, intercept a project group of a, copy to B, B must be of type int

NSString *a = @ "1.2.30";

int b= [[a Substringwithrange:nsmakerange (4,2)] intvalue];

NSLog (@ "a:%@ \ n", a);

NSLog (@ "b:%d", b);

output:2011-07-05 11:49:08.170 q[4005:207] a:1.2.30

2011-07-05 11:49:08.172 q[4005:207] b:30

The parsing is as follows: Substringwithrange: A piece of string specifically intercepted

Nsmakerange (4,2) from the beginning of the 4th character intercept, the length of 2 characters, (the string is the beginning of the No. 0 character of the first number OH ~!) ）

Two. String intercept to Nth bit (substringtoindex:n) (nth bit not counted)

NSString *a = @ "I like long dress";

NSString *b = [a substringtoindex:4];

NSLog (@ "B:%@", b);

2011-07-11 18:12:40.119 q[6321:207] b:i Li

Three. The string is truncated from the beginning of the nth bit until the last (substringfromindex:n) (contains nth bits)

NSString *a = @ "I like long dress";

NSString *b = [a substringfromindex:4];

NSLog (@ "B:%@", b);

2011-07-11 18:15:08.125 q[6366:207] b:ke long dress

IOS NSString intercept strings (intercepted by index)