MUtility.h

iOS_snippets

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

@interface MUtility : NSObject  {

}

/**获取随机数**/
+ (int) randomNumber;

/**随机获取颜色**/
+ (UIColor *) randomColor;

/**获取Documents下的文件路径**/
+ (NSString *) documentPathForFile:(NSString *)fileName;

/**计算字符串的高度**/
+ (CGFloat)getStringHeight:(NSString *)string font:(UIFont *)font;

/**读取本地数据到一个数组变量中**/
+ (NSMutableArray *) getDataArrayFromFile:(NSString *)fileName;

@end

MUtility.m

#import "MUtility.h"

@implementation MUtility



+ (int)randomNumber
{
	srandom(time(NULL));
	return random()%100 +1;
}


+ (UIColor *)randomColor
{
	static BOOL seeded = NO;
	if (!seeded) {
		seeded = YES;
		srandom(time(NULL));
	}
	CGFloat red =  (CGFloat)random()/(CGFloat)RAND_MAX;
	CGFloat blue = (CGFloat)random()/(CGFloat)RAND_MAX;
	CGFloat green = (CGFloat)random()/(CGFloat)RAND_MAX;
	return [UIColor colorWithRed:red green:green blue:blue alpha:1.0f];
}



+ (CGFloat)getStringHeight:(NSString *)string font:(UIFont *)font {
	CGSize size = [string sizeWithFont:font 
					 constrainedToSize:CGSizeMake(300.0f, 1000000.0f) 
						 lineBreakMode:UILineBreakModeWordWrap];
	return size.height;
}

+ (NSString *)documentPathForFile:(NSString *)fileName
{
	// NSLog(@"documents: %@",NSHomeDirectory());
	return [NSHomeDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"Documents/%@",fileName]];
}


+ (NSMutableArray *) getDataArrayFromFile:(NSString *)fileName
{
	NSString *filePath = [MUtility documentPathForFile:fileName];
	NSFileManager *fileManager = [NSFileManager defaultManager];
	if (![fileManager fileExistsAtPath:filePath]) {
		NSMutableArray *initArray = [[[NSMutableArray alloc] initWithCapacity:0] autorelease];
		[initArray writeToFile:filePath atomically:YES];
	}
	
	return [[NSMutableArray alloc] initWithContentsOfFile:filePath];
}



@end