iOS开发常用方法及设置总结

1.使用valueForKeyPath求数组和、最大值、最小值及平均值

NSMutableArray* array = [NSMutableArray array];
for (int i = 0; i < 10; i++) {
  CGFloat num = arc4random() % 100 + 1;
  [array addObject:[NSNumber numberWithFloat:num]];
}  
CGFloat sumValue = [[array valueForKeyPath:@"@sum.floatValue"] floatValue];
CGFloat maxValue = [[array valueForKeyPath:@"@max.floatValue"] floatValue];
CGFloat minValue = [[array valueForKeyPath:@"@min.floatValue"] floatValue];
CGFloat avgValue = [[array valueForKeyPath:@"@avg.floatValue"] floatValue];

2.获取汉字对应的拼音

 + (NSString *)getPinyinFormChinese:(NSString *)chinese {
    // 将NSString装换成NSMutableString
    NSMutableString *pinyin = [chinese mutableCopy];
    // 将汉字转换为拼音(带音标)
    CFStringTransform((__bridge CFMutableStringRef)pinyin, NULL, kCFStringTransformMandarinLatin, NO);
    // 去掉拼音的音标(不带音标)
    CFStringTransform((__bridge CFMutableStringRef)pinyin, NULL, kCFStringTransformStripCombiningMarks, NO);
    return pinyin;
}

3.代码执行效率检测

CFAbsoluteTime start = CFAbsoluteTimeGetCurrent();
 {测试代码}
CFAbsoluteTime end = CFAbsoluteTimeGetCurrent();
NSLog(@"代码执行时间: %0.3f", end - start);

4.生成随机字符串

NSInteger length = 10;    
char data[length];   
for (int i = 0; i < length; i++) {       
    data[i] = 'A' + (arc4random_uniform(26));    
}
NSString *string = [[NSString alloc] initWithBytes:data length:length encoding:NSUTF8StringEncoding];

5.设置应用可以通过iTunes与电脑传输文件

在Info.plist中添加Application supports iTunes file sharing字段 Value设置为YES

6.Xcode文件路径

项目描述文件路径： ~/Library/MobileDevice/Provisioning Profiles
打包项目路径（Archive）：~/Library/Developer/Xcode/Products

7.UIView转换为UIImage

// 将UIView转换为UIImage
- (UIImage *)convertViewToImage:(UIView *)view {
    CGSize size = view.bounds.size;
   // 下面方法，第一个参数表示区域大小。第二个参数表示是否是非透明的。如果需要显示半透明效果，需要传NO，否则传YES。第三个参数就是屏幕密度了
    UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}