获取字符串的宽度跟高度

- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.           //获取字符串的宽度    NSLog(@"获得字符串的宽度:%f",[self widthForString:@"我爱你！我爱你！我爱你！我爱你！我爱你！我爱你！我爱你！我爱你！" fontSize:10.0 andHeight:10.0]);        //获取字符串的高度    NSLog(@"获得字符串的宽度:%f",[self heightForString:@"我爱你！我爱你！我爱你！我爱你！我爱你！我爱你！我爱你！我爱你！" fontSize:10.0 andWidth:10.0]);            }#pragma -mark -functions//获取字符串的宽度-(float) widthForString:(NSString *)value fontSize:(float)fontSize andHeight:(float)height{    CGSize sizeToFit = [value sizeWithFont:[UIFont systemFontOfSize:fontSize] constrainedToSize:CGSizeMake(CGFLOAT_MAX, height) lineBreakMode:NSLineBreakByWordWrapping];//此处的换行类型（lineBreakMode）可根据自己的实际情况进行设置    return sizeToFit.width;}//获得字符串的高度-(float) heightForString:(NSString *)value fontSize:(float)fontSize andWidth:(float)width{    CGSize sizeToFit = [value sizeWithFont:[UIFont systemFontOfSize:fontSize] constrainedToSize:CGSizeMake(width, CGFLOAT_MAX) lineBreakMode:NSLineBreakByCharWrapping];//此处的换行类型（lineBreakMode）可根据自己的实际情况进行设置    return sizeToFit.height;}