如何增加整个应用程序的字体大小？

Question

我正在处理需要更改所有控件的动态字体大小的应用程序。

正如您在截图中看到的，我必须根据字体大小的百分比更改字体。

例如

100％

lbl.font=[UIFont systemFontOfSize:20.0f];
lbl1.font=[UIFont systemFontOfSize:30.f];

80％

lbl.font=[UIFont systemFontOfSize:16.0f];
lbl1.font=[UIFont systemFontOfSize:24.f];

50％

lbl.font=[UIFont systemFontOfSize:10.0f];
lbl1.font=[UIFont systemFontOfSize:15.f];

最好的方法是什么？

Answer 1

您可以使用UIAppearance。 Tutorial link

＆安培;请看this。

Here's a list of classes that support this feature, in one way or the other.

UIActivityIndicatorView
UIBarButtonItem
UIBarItem
UINavigationBar
UIPopoverController
UIProgressView
UISearchBar
UISegmentedControl
UISlider
UISwitch
UITabBar
UITabBarItem
UIToolbar
UIView
UIViewController

的实施例 的

<强> UIActivityIndi​​catorView：

[[UIActivityIndicatorView appearance] setColor:[UIColor orangeColor]];

<强> UINavigationBar的：

[[UINavigationBar appearance] setTintColor:[UIColor brownColor]];
[[UINavigationBar appearanceWhenContainedIn:[MyCustomView class], nil] setTintColor:[UIColor blackColor]];

<强>的UIBarButtonItem：

[[UIBarButtonItem appearance] setTintColor:[UIColor redColor]];
[[UIBarButtonItem appearanceWhenContainedIn:[MyCustomView class], nil] setTintColor:[UIColor magentaColor]];

<强> UIProgressView：

[[UIProgressView appearance] setProgressTintColor:[UIColor yellowColor]];
[[UIProgressView appearance] setTrackTintColor:[UIColor greenColor]];

<强> UISegmentedControl：

UIImage *segmentSelected = [[UIImage imageNamed:@"Segment_Selected.png"]
                        resizableImageWithCapInsets:UIEdgeInsetsMake(0, 12, 0, 12)];
UIImage *segmentUnselected = [[UIImage imageNamed:@"Segment_Unselected.png"]
                          resizableImageWithCapInsets:UIEdgeInsetsMake(0, 12, 0, 12)];

[[UISegmentedControl appearance] setBackgroundImage:segmentUnselected
                                               forState:UIControlStateNormal
                                             barMetrics:UIBarMetricsDefault];
[[UISegmentedControl appearance] setBackgroundImage:segmentSelected
                                               forState:UIControlStateSelected
                                             barMetrics:UIBarMetricsDefault];

[[UISegmentedControl appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                        [UIColor magentaColor],UITextAttributeTextColor,
                                        [UIColor clearColor], UITextAttributeTextShadowColor,
                                        [NSValue valueWithUIOffset:UIOffsetMake(0, 0)], UITextAttributeTextShadowOffset,
                                        [UIFont fontWithName:@"Courier-Oblique" size:16.0], UITextAttributeFont, nil] forState:UIControlStateNormal];

[[UISegmentedControl appearance] setDividerImage:[UIImage imageNamed:@"SegmentedControl_Divider.png"]
                                 forLeftSegmentState:UIControlStateNormal
                                   rightSegmentState:UIControlStateNormal
                                          barMetrics:UIBarMetricsDefault];

<强> UISlider：

[[UISlider appearance] setMinimumTrackImage:[UIImage imageNamed:@"Slider_Background.png"]
                                       forState:UIControlStateNormal];
[[UISlider appearance] setMaximumTrackImage:[UIImage imageNamed:@"Slider_Background.png"]
                                       forState:UIControlStateNormal];
[[UISlider appearance] setThumbImage:[UIImage imageNamed:@"Slider_Thumb.png"]
                                forState:UIControlStateNormal];

UISwitch：

[[UISwitch appearance] setOnTintColor:[UIColor redColor]];

UITabBar：

[[UITabBar appearance] setTintColor:[UIColor brownColor]];
[[UITabBar appearance] setSelectedImageTintColor:[UIColor greenColor]];

UIToolBar：

[[UIToolbar appearance] setTintColor:[UIColor blueColor]];

<强>的UISearchBar：

[[UISearchBar appearance] setImage:[UIImage imageNamed:@"Search_Icon.png"]
                      forSearchBarIcon:UISearchBarIconSearch
                                 state:UIControlStateNormal];
[[UISearchBar appearance] setImage:[UIImage imageNamed:@"Search_Cross.png"]
                      forSearchBarIcon:UISearchBarIconClear
                                 state:UIControlStateNormal];
UIImage *searchBg = [UIImage imageNamed:@"Search_Background.png"];
searchBg = [searchBg stretchableImageWithLeftCapWidth:10 topCapHeight:10];
[[UISearchBar appearance] setBackgroundImage:searchBg];

修改

这取决于你。假设您应将百分比大小存储到NSUSerDefaults或其他存储中。然后使用上面的代码，您可以根据您存储的百分比计算大小。知道了吗？

Answer 2

回答我自己的问题。我不确定是最好的方法。

  

枚举用于不同的字体大小

  typedef enum {
    UIFontCategoryExtraSmall,
    UIFontCategorySmall,
    UIFontCategoryMedium,
    UIFontCategoryLarge,
    UIFontCategoryExtraLarge
} UIFontCategory;

#define FONT_SIZE_KEY @"fontsize"

  

UIFont的类别类

@interface UIFont (CustomFonSize)

+(UIFont *)preferredFontSizeWithMaxFontSize:(CGFloat )fontSize;

@end



 @implementation UIFont (AvenirContentSize)

+ (UIFont *)preferredFontSizeWithMaxFontSize:(CGFloat )fontSize; {
    // choose the font size
    NSInteger currentFontSize=[[NSUserDefaults standardUserDefaults]integerForKey:FONT_SIZE_KEY];

    if (currentFontSize==UIFontCategoryExtraSmall) {
        fontSize = fontSize-8;

    } else if (currentFontSize==UIFontCategorySmall) {
        fontSize = fontSize-6;

    } else if (currentFontSize==UIFontCategoryMedium) {
        fontSize = fontSize-4;

    } else if (currentFontSize==UIFontCategoryLarge) {
        fontSize = fontSize-2;

    } else if (currentFontSize==UIFontCategoryExtraLarge) {
        fontSize = fontSize;

    }

    return [UIFont systemFontOfSize:fontSize];


}

使用自定义字体类

lbl.font=[UIFont preferredFontSizeWithMaxFontSize:16.0f];
lbl1.font=[UIFont preferredFontSizeWithMaxFontSize:24.f];