iOS Label的宽度和高度自适应

1、创建category

.h中创建俩个方法

+ (CGFloat)getHeightByWidth:(CGFloat)width title:(NSString *)title font:(UIFont*)font;

+ (CGFloat)getWidthWithTitle:(NSString *)title font:(UIFont *)font;

.m中实现俩个方法

+ (CGFloat)getHeightByWidth:(CGFloat)width title:(NSString *)title font:(UIFont *)font

{

    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, width, 0)];

    label.text = title;

    label.font = font;

    label.numberOfLines = 0;

    [label sizeToFit];

    CGFloat height = label.frame.size.height;

    return height;

}

+ (CGFloat)getWidthWithTitle:(NSString *)title font:(UIFont *)font

 {

    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 1000, 0)];

    label.text = title;

    label.font = font;

    [label sizeToFit];

    return label.frame.size.width;

}

使用时引入创建的category头文件

- (void)buildLabelOne

{

    UILabel *labelOne = [[UILabel alloc] initWithFrame:CGRectMake(10, 30, 200, 50)];

    labelOne.text = @"使用时引入创建的category头文件使用时引入创建的category头文件使用时引入创建的category头文件使用时引入创建的category头文件使用时引入创建的category头文件";

    labelOne.backgroundColor = [UIColor grayColor];

    labelOne.font = [UIFont systemFontOfSize:20];

    labelOne.numberOfLines = 0;

    CGFloat height = [UILabel getHeightByWidth:labelOne.frame.size.width title:labelOne.text font:labelOne.font];

    labelOne.frame = CGRectMake(10, 30, 200, height);

    [self.view addSubview:labelOne];

    

}

#pragma mark - labelTwo  SizeToFitWidth

- (void)buildLabelTwo

{

    UILabel *labelTwo = [[UILabel alloc] initWithFrame:CGRectMake(10, 300, 50, 100)];

    labelTwo.text = @"使用时引入创建的category头文件使用时引入创建的category头文件使用时引入创建的category头文件使用时引入创建的category头文件";

    labelTwo.backgroundColor = [UIColor cyanColor];

    labelTwo.font = [UIFont systemFontOfSize:20];

    CGFloat width = [UILabel getWidthWithTitle:labelTwo.text font:labelTwo.font];

    labelTwo.frame = CGRectMake(10, 300, width, 100);

    [self.view addSubview:labelTwo];

}

基本上就是这样的。。。