view层控件比较优雅写法

From >>> https://github.com/ChangBoHua/CBUIKit

感觉这种写法可以节省很多代码，比较优雅，之前有用过vc分类来写，在view上就不能用，有点局限，还是用object来的方便
//调用
- (UILabel *)currentLabel{

    if (!_currentLabel) {
        _currentLabel = [CBUIKit createLabelWithTextColor:[UIColor orangeColor]
                                                 fontSize:15];
    }
    return _currentLabel;
}

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface CBUIKit : NSObject

+ (UILabel *)createLabelWithTextColor:(UIColor *)textColor
                        fontSize:(CGFloat)fontSize;

@implementation CBUIKit
+ (UILabel *)createLabelWithTextColor:(UIColor *)textColor
                             fontSize:(CGFloat)fontSize{
   UILabel *label = [[UILabel alloc] initWithFrame:frame];
    label.backgroundColor = backgroundColor;
    label.textColor = textColor;
    label.textAlignment = textAlignment;
    label.numberOfLines = numberOfLines;
    label.text = text;
    label.font = [UIFont systemFontOfSize:fontSize];
    return label;
}