Debug方式

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在平常写程序中,有很多地方都需要采用NSLog来定位bug,不过代码一长,寻找起来就很费时间了。将系统定义的一些表达式用在NSLog中,可以快速的帮助我们进行debug。

方法1:


- (instancetype)initWithFrame:(CGRect)frame {        self = [super initWithFrame:frame];    if (self) {        self.backgroundColor = [UIColor clearColor];                externalRadius = MIN(self.frame.size.width, self.frame.size.height) /2;        innerRadius = 0.7 * externalRadius;                self.label = [[UILabel alloc] init];        self.label.backgroundColor = [UIColor clearColor];        self.label.font = self.labelFont;        self.label.textColor = [UIColor whiteColor];//self.labelColor;        self.label.text = @"GIF";        self.label.textAlignment = NSTextAlignmentCenter;        self.label.numberOfLines = 1;        self.label.frame = CGRectMake(externalRadius - sqrt(2)*innerRadius/2, MAX(self.frame.size.width, self.frame.size.height)/2 - sqrt(2)*innerRadius/2, sqrt(2)*innerRadius, sqrt(2)*innerRadius);        [self addSubview:self.label];                NSLog(@"\n Function:%s\n Pretty function:%s\n Line:%d\n File:%s\n", __func__, __PRETTY_FUNCTION__, __LINE__, __FILE__);    }        return self;}
输出结果为:


也可以将

NSLog(@"\n Function:%s\n Pretty function:%s\n Line:%d\n File:%s\n", __func__, __PRETTY_FUNCTION__, __LINE__, __FILE__);

更换为

NSLog(@"Current Selector: %@", NSStringFromSelector(_cmd));        NSLog(@"Object Class:%@", NSStringFromClass([self class]));        NSLog(@"File Name: %@", [NSString stringWithUTF8String:__FILE__].lastPathComponent);

输出结果如下:


总之,需要灵活运用系统定义的预留词和Core Foundation的一些方法。

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