object c 类型转换

Convert Integer to NSString:

int Value = 112233;
NSString *ValueString = [NSString stringWithFormat:@"%d", Value];

Convert Integer to C String:

int Value = 112233;
NSString *ValueString = [NSString stringWithFormat:@"%d", Value];
char *ValueasCString = (char *)[ValueString UTF8String];

 

Convert String to Integer or float

NSString has some useful methods:
-(int) intValue
-(float) floatValue