ios模仿android屏幕密度控件自动适配

前些日子出来了iphone6和6plus 使的iOS的适配再也不适合用绝对布局了本人之前一直是做android开发的最近开始学起了ios 于是也自然而然的学起了蛋疼的autolayout适配现在在storyboard中是能够熟练用约束适配了但是总有些特殊情况需要在逻辑代码中适配于是我想起了android的屏幕密度概念就想写个工具类使得在ios的controller中也能轻松的设置控件的具体大小和比例并自动适配

必须要在项目启用了autolayout之后才能用因为工具类里是用vfl来设置大小的
android的屏幕密度其实不是这个意思计算也比这个复杂的多不过是借个概念实现个差不多的效果
这个工具类主要是用来在使用autolayout布局时设置某个控件一个具体的像素大小的只不过这个控件的这个具体大小会根据屏幕自动拉伸适配
设置具体大小的原始标准是4寸屏，设大小时要参照这个也就是说比如界面上有个button 在4寸屏时希望他宽高都是50像素那就直接把他设为50就行了到了4.7寸和5.5寸时他的大小自然会等比扩大，至于这个button扩大之后的位置这个当然在用autolayout的布局约束时就已经控制好的了
这个适配方法可能不是很好，可能是我才初学不清楚autolayout的强大因为不是所有的界面需要显示的控件都能通过他和周围控件的约束就能适配的直接约束控件大小的话在4寸屏显示正好但是到了5.5寸虽然位置什么的都正常但是大小却会变的偏小了但我觉得autolayout不应该解决不了这个问题的啊所以在此做个保留可能是我还没真正领悟到autolayout 下面贴上工具类代码仅供参考吧

#import<Foundation/Foundation.h>#import<UIKit/UIKit.h>@interfaceDensity:NSObject/**模拟android屏幕密度的概念*/+(NSInteger)pixelsToDip:(float)pixels;//pixels转dip+(void)setWidth:(UIView*)viewcurrentView:(UIView*)currentViewpixels:(float)pixels;//设置控件自动适配的width+(void)setHeight:(UIView*)viewcurrentView:(UIView*)currentViewpixels:(float)pixels;//设置控件自动适配的height+(void)setSize:(UIView*)viewcurrentView:(UIView*)currentViewpixels:(float)pixels;//自动适配控件拉伸比例(宽高相同)+(void)setSize:(UIView*)viewcurrentView:(UIView*)currentViewxPixels:(float)xPixelsyPixels:(float)yPixels;//自动适配控件拉伸比例(宽高不同)+(void)setTextFont:(UILabel*)viewsize:(float)size;//自动适配Label文字大小+(void)setMutableWidth:(UIView*)viewcurrentView:(NSDictionary*)currentViewpixels:(float)pixels;//批量自动适配控件宽度拉伸比例(宽高相同)+(void)setMutableSize:(UIView*)viewcurrentView:(NSDictionary*)currentViewxPixels:(float)xPixelsyPixels:(float)yPixels;//批量自动适配控件拉伸比例(宽高不同)+(void)setMutableTextFont:(NSDictionary*)currentViewsize:(float)size;//批量自动适配Label文字大小@end

#import"Density.h"@implementationDensity+(NSInteger)pixelsToDip:(float)pixels{return[[UIScreenmainScreen]bounds].size.width*pixels/320;}+(void)setWidth:(UIView*)viewcurrentView:(UIView*)currentViewpixels:(float)pixels{NSDictionary*childDis=NSDictionaryOfVariableBindings(currentView);NSIntegercurrentX=[DensitypixelsToDip:pixels];NSMutableDictionary*metrics=[[NSMutableDictionaryalloc]init];[metricssetObject:[NSStringstringWithFormat:@"%ld",(long)currentX]forKey:@"currentX"];[viewaddConstraints:[NSLayoutConstraintconstraintsWithVisualFormat:@"[currentView(currentX)]"options:0metrics:metricsviews:childDis]];}+(void)setHeight:(UIView*)viewcurrentView:(UIView*)currentViewpixels:(float)pixels{NSDictionary*childDis=NSDictionaryOfVariableBindings(currentView);NSIntegercurrentX=[DensitypixelsToDip:pixels];NSMutableDictionary*metrics=[[NSMutableDictionaryalloc]init];[metricssetObject:[NSStringstringWithFormat:@"%ld",(long)currentX]forKey:@"currentX"];[viewaddConstraints:[NSLayoutConstraintconstraintsWithVisualFormat:@"V:[currentView(currentX)]"options:0metrics:metricsviews:childDis]];}+(void)setSize:(UIView*)viewcurrentView:(UIView*)currentViewpixels:(float)pixels{NSDictionary*childDis=NSDictionaryOfVariableBindings(currentView);NSIntegercurrentX=[DensitypixelsToDip:pixels];NSMutableDictionary*metrics=[[NSMutableDictionaryalloc]init];[metricssetObject:[NSStringstringWithFormat:@"%ld",(long)currentX]forKey:@"currentX"];[viewaddConstraints:[NSLayoutConstraintconstraintsWithVisualFormat:@"[currentView(currentX)]"options:0metrics:metricsviews:childDis]];[viewaddConstraints:[NSLayoutConstraintconstraintsWithVisualFormat:@"V:[currentView(currentX)]"options:0metrics:metricsviews:childDis]];}+(void)setSize:(UIView*)viewcurrentView:(UIView*)currentViewxPixels:(float)xPixelsyPixels:(float)yPixels{NSDictionary*childDis=NSDictionaryOfVariableBindings(currentView);NSIntegercurrentX=[DensitypixelsToDip:xPixels];NSIntegercurrentY=[DensitypixelsToDip:yPixels];NSMutableDictionary*metrics=[[NSMutableDictionaryalloc]init];[metricssetObject:[NSStringstringWithFormat:@"%ld",(long)currentX]forKey:@"currentX"];[metricssetObject:[NSStringstringWithFormat:@"%ld",(long)currentY]forKey:@"currentY"];[viewaddConstraints:[NSLayoutConstraintconstraintsWithVisualFormat:@"[currentView(currentX)]"options:0metrics:metricsviews:childDis]];[viewaddConstraints:[NSLayoutConstraintconstraintsWithVisualFormat:@"V:[currentView(currentY)]"options:0metrics:metricsviews:childDis]];}+(void)setTextFont:(UILabel*)viewsize:(float)size{view.font=[UIFontfontWithName:@"Helvetica-Bold"size:[DensitypixelsToDip:size]];}+(void)setMutableSize:(UIView*)viewcurrentView:(NSDictionary*)currentViewxPixels:(float)xPixelsyPixels:(float)yPixels{NSIntegercurrentX=[DensitypixelsToDip:xPixels];NSIntegercurrentY=[DensitypixelsToDip:yPixels];NSMutableDictionary*metrics=[[NSMutableDictionaryalloc]init];[metricssetObject:[NSStringstringWithFormat:@"%ld",(long)currentX]forKey:@"currentX"];[metricssetObject:[NSStringstringWithFormat:@"%ld",(long)currentY]forKey:@"currentY"];for(NSString*keyincurrentView){NSString*vfl=[NSStringstringWithFormat:@"[%@(currentX)]",key];NSString*vflY=[NSStringstringWithFormat:@"V:[%@(currentX)]",key];[viewaddConstraints:[NSLayoutConstraintconstraintsWithVisualFormat:vfloptions:0metrics:metricsviews:currentView]];[viewaddConstraints:[NSLayoutConstraintconstraintsWithVisualFormat:vflYoptions:0metrics:metricsviews:currentView]];}}+(void)setMutableTextFont:(NSDictionary*)currentViewsize:(float)size{for(NSString*keyincurrentView){UILabel*label=[currentViewobjectForKey:key];label.font=[UIFontfontWithName:@"Helvetica-Bold"size:[DensitypixelsToDip:size]];}}+(void)setMutableWidth:(UIView*)viewcurrentView:(NSDictionary*)currentViewpixels:(float)pixels{NSIntegercurrentX=[DensitypixelsToDip:pixels];NSMutableDictionary*metrics=[[NSMutableDictionaryalloc]init];[metricssetObject:[NSStringstringWithFormat:@"%ld",(long)currentX]forKey:@"currentX"];for(NSString*keyincurrentView){NSString*vfl=[NSStringstringWithFormat:@"[%@(currentX)]",key];[viewaddConstraints:[NSLayoutConstraintconstraintsWithVisualFormat:vfloptions:0metrics:metricsviews:currentView]];}}@end

最后贴个使用

[DensitysetSize:self.viewcurrentView:_logoxPixels:262yPixels:82];

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