.h文件

//
//  Tools.h

//

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

@interface Tools : NSObject

/**
 *  通过文件路径加载图片
 *  该方法加载图片优势：不会将图片加到内存缓存中（适用类型：较大图片的处理）
 *
 *  @param imgName 图片名称（带扩展名）eg：btn_login.png
 *
 *  @return 返回图片对象
 */
+(UIImage *)imageWithName:(NSString *)imgName;

// 创建一个按钮 （以图片展现）
+(UIButton *)createButtonNormalImage:(NSString *)normalImageName selectedImage:(NSString *)selectImageName tag:(NSUInteger)tag addTarget:(id)target action:(SEL)action;

// 创建UILabel
+(UILabel *)createLabelWithFrame:(CGRect)frame textContent:(NSString *)text withFont:(UIFont *)font textColor:(UIColor *)color textAlignment:(NSTextAlignment)align;

@end

.m文件

//
//  Tools.m


//

#import "Tools.h"

@implementation Tools

/**
 *  通过文件路径加载图片
 *  该方法加载图片优势：不会将图片加到内存缓存中（适用类型：较大图片的处理）
 *
 *  @param imgName 图片名称（带扩展名）eg：btn_login.png
 *
 *  @return 返回图片对象
 */
+(UIImage *)imageWithName:(NSString *)imgName
{
    if(imgName){
        NSString * path = [[NSBundle mainBundle] pathForResource:imgName ofType:nil];
        UIImage * image = [UIImage imageWithContentsOfFile:path];
        return image;
    }
    
    return nil;
}

// 创建一个按钮 （以图片展现）
+(UIButton *)createButtonNormalImage:(NSString *)normalImageName selectedImage:(NSString *)selectImageName tag:(NSUInteger)tag addTarget:(id)target action:(SEL)action
{
    UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom];
    [btn setImage:[UIImage imageNamed:normalImageName] forState:UIControlStateNormal];
    [btn setImage:[UIImage imageNamed:selectImageName] forState:UIControlStateSelected];
    [btn setImage:[UIImage imageNamed:selectImageName] forState:UIControlStateHighlighted];
    btn.tag = tag;
    [btn addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
    
    return btn;
}

// 创建UILabel
+(UILabel *)createLabelWithFrame:(CGRect)frame textContent:(NSString *)text withFont:(UIFont *)font textColor:(UIColor *)color textAlignment:(NSTextAlignment)align
{
    UILabel * label = [[UILabel alloc] initWithFrame:frame];
    label.font = font;
    label.textColor = color;
    label.textAlignment = align;
    label.text = text;
    
    return label;
}

@end