iOS UILabel计算宽度和高度

时间 2019-11-13

标签 ios uilabel 计算宽度高度栏目 iOS 繁體版

原文原文链接

一、根据文本计算size，这里须要传入attributeside

    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(20, 100, 0, 0)];
    label.text = @"12331afaa我是谁的谁";
    label.textColor = [UIColor redColor];
    label.backgroundColor = [UIColor greenColor];
    label.font = [UIFont systemFontOfSize:20];
    [self.view addSubview:label];

    CGSize size = [label.text sizeWithAttributes:@{NSFontAttributeName:label.font}];
    label.frame = CGRectMake(20, 100, size.width, size.height);
    // width:193.482031    heigth:23.867188

Method 1

二、富文本计算sizespa

    CGSize size = [label.attributedText size];
    label.frame = CGRectMake(20, 100, size.width, size.height);
    // width:193.482031    heigth:23.867188

Method 2

三、经过UIView的 sizeThatFits3d

    // 在单行文本的状况下，参数size设置多少都无所谓，因此里传了CGSizeZero
    CGSize size = [label sizeThatFits:CGSizeZero];
    label.frame = CGRectMake(20, 100, size.width, size.height);
    // width:193.500000    heigth:24.000000
    
    // 可用此方法计算高度
    label.text = @"ABCDEFGHIJKLMN";
    label.numberOfLines = 0;
    label.textAlignment = NSTextAlignmentCenter;
    CGSize size = [label sizeThatFits:CGSizeMake(15, 0)];
    label.frame = CGRectMake(20, 100, size.width, size.height);
    // width:15.000000    heigth:334.500000

Method 3