IOS: 以编程方式设置 UILabel 的字体大小

我正在设置 UILabel 的字体大小。无论我把什么值，虽然文本大小似乎没有改变。这是我用的代码。

[self setTitleLabel:[[UILabel alloc] initWithFrame:CGRectMake(320.0,0.0,428.0,50.0)]];
[[self contentView] addSubview:[self titleLabel]];
UIColor *titlebg = [UIColor clearColor];
[[self titleLabel] setBackgroundColor:titlebg];
[[self titleLabel] setTextColor:[UIColor blackColor]];
[[self titleLabel] setFont:[UIFont fontWithName:@"System" size:36]];

ios
uilabel

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最佳答案

Try [UIFont systemFontOfSize:36] or [UIFont fontWithName:@"HelveticaNeue" size:36] i.e. [[self titleLabel] setFont:[UIFont systemFontOfSize:36]];

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This code is perfectly working for me.

  UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(15,23, 350,22)];
[label setFont:[UIFont systemFontOfSize:11]];

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Its BECAUSE there is no font family with name @"System" hence size:36 will also not work ...

Check the fonts available in xcode in attribute inspector and try

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If you are looking for swift code:

var titleLabel = UILabel()
titleLabel.font = UIFont(name: "HelveticaNeue-UltraLight",
size: 20.0)

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Objective-C:

[label setFont: [label.font fontWithSize: sizeYouWant]];

Swift:

label.font = label.font.fontWithSize(sizeYouWant)

just changes font size of a UILabel.

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For iOS 8

  static NSString *_myCustomFontName;


+ (NSString *)myCustomFontName:(NSString*)fontName
{
if ( !_myCustomFontName )
{
NSArray *arr = [UIFont fontNamesForFamilyName:fontName];
// I know I only have one font in this family
if ( [arr count] > 0 )
_myCustomFontName = arr[0];
}


return _myCustomFontName;


}

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In Swift 3.0, you could use this code below:

let textLabel = UILabel(frame: CGRect(x:containerView.frame.width/2 - 35, y:
containerView.frame.height/2 + 10, width: 70, height: 20))
textLabel.text = "Add Text"
textLabel.font = UIFont(name: "Helvetica", size: 15.0) // set fontName and Size
textLabel.textAlignment = .center
containerView.addSubview(textLabel) // containerView is a UIView

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Swift 3.0 / Swift 4.2 / Swift 5.0

labelName.font = labelName.font.withSize(15)