根据UILabel字体大小调整CGSize

Question

The CGSize which I am getting is longer in height than the label font. I want to remove the top/left/right/bottom padding between the text and the UILabel edges so that the UILabel frame just fits the text it contains.

This is the code I am using....

NSString *ad=@"hello"; 
NSDictionary *fontAttributes = @{NSFontAttributeName : [UIFont systemFontOfSize:50]}; 
CGSize textSize = [ad sizeWithAttributes:fontAttributes]; 
bc =[[UILabel alloc]initWithFrame:CGRectMake(20, 25, textSize.width, textSize.height)]; 
bc.font= [UIFont systemFontOfSize:50]; 
bc.text=ad; 
bc.layer.borderColor = [UIColor blackColor].CGColor; 
bc.layer.borderWidth = 1.0; 

[self.tap addSubview:bc];

Answer 1

You do not have to get CGSize textSize to allocate your UILabel .

Using autolayout in your label:

1. Add your label top,leading, trailing constraints in your xib.
2. Set numberOfLines property to 0
3. Set preferredMaxLayout width in your VC(if your development target < iOS8)
4. Set whatever text you want.

Answer 2

You can do this by setting the property of sizeToFitContent if you have dragged it in view. Programmatically, you can try sizeToFit.

Answer 3

Try this:

    NSString *mytext = @"some random text";
    UILabel *someLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 100, 280, 100)];
    someLabel.text = mytext;
    someLabel.backgroundColor = [UIColor clearColor];
    someLabel.lineBreakMode = NSLineBreakByWordWrapping;
    [self.view addSubview:someLabel];

    // For single line
    someLabel.numberOfLines = 1;
    someLabel.minimumScaleFactor = 8;
    someLabel.adjustsFontSizeToFitWidth = YES;

    // For multiple lines
    someLabel.numberOfLines = 0;
    someLabel.lineBreakMode = NSLineBreakByWordWrapping;
    CGSize maximumLabelSize = CGSizeMake(someLabel.frame.size.width, CGFLOAT_MAX);
    CGSize expectSize = [someLabel sizeThatFits:maximumLabelSize];
    someLabel.frame = CGRectMake(someLabel.frame.origin.x, someLabel.frame.origin.y, expectSize.width, expectSize.height);