UI基础第二天（自学）

一、绘制NSString

• 创建UIView的子类，重写drawRect:方法，在drawRect:方法中调用用于绘制字符串的方法

#import "SSString.h"

@implementation SSString

-(void)drawRect:(CGRect)rect{
    //设置系统默认字体的大小
    UIFont *sytemFont = [UIFont systemFontOfSize:[UIFont systemFontSize]];
    //不能自动换行；drawAtPoint:表示绘制字符串的左上角；withFont:表示字体
    //[self.String drawAtPoint:CGPointMake(0, 0) withFont:sytemFont];
    //自动换行；drawInRect:表示制定绘制范围；
    //[self.String drawInRect:rect withFont:sytemFont];
    //换行与省略；lineBreakMode:表示制定省略与换行的模式
    //[self.String drawInRect:rect withFont:sytemFont lineBreakMode:UILineBreakModeTailTruncation];
    //横向位置的控制；alignment:表示制定靠左或居中或靠右
    //[self.String drawInRect:rect withFont:sytemFont lineBreakMode:UILineBreakModeTailTruncation alignment:UITextAlignmentCenter];
    //字符的缩小与位置控制；forWidth:表示绘制界面的宽度；fontSize:表示文字缩小的值；baselineAdjustment:表示缩小纵向的位置
    //[self.String drawAtPoint:CGPointMake(0, 0) forWidth:375 withFont:sytemFont fontSize:10 lineBreakMode:UILineBreakModeTailTruncation baselineAdjustment:UIBaselineAdjustmentAlignBaselines];
    //字符串的自动缩小；minFontSize:表示允许缩小的最小值；actualFontSize:表示输出指针型参数，取得实际绘制字符串的字体尺寸，如果不需要此参数可以写NULL
    CGFloat actualFontSize;
    [self.String drawAtPoint:CGPointMake(0, 0) forWidth:375 withFont:sytemFont minFontSize:5 actualFontSize:&actualFontSize lineBreakMode:UILineBreakModeWordWrap baselineAdjustment:UIBaselineAdjustmentAlignBaselines];
    NSLog(@"%F",actualFontSize);
}

@end

• 在viewDidLoad方法中调用该类创建对象，设置属性并添加到父视图

#import "ViewController.h"
#import "SSString.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    SSString *str = [[SSString alloc]init];
    str.frame = CGRectMake(0, 200, 375, 50);
    str.backgroundColor = [UIColor greenColor];
    str.String = @"回忆里阳光温暖，光线照射在阿北的脸上，总觉得是温润如玉的，却不知是时光在他脸上宣泄，慢慢淌过，便是岁月流逝。";
    [self.view addSubview:str];  
}

@end

二、UIFont

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    UILabel *lable1 = [self buildLabelWithFrame:CGRectMake(0, 40, 375, 50)];
    UILabel *lable2 = [self buildLabelWithFrame:CGRectMake(0, 120, 375, 50)];
    UILabel *lable3 = [self buildLabelWithFrame:CGRectMake(0, 200, 375, 50)];
    UILabel *lable4 = [self buildLabelWithFrame:CGRectMake(0, 280, 375, 50)];
    UILabel *lable5 = [self buildLabelWithFrame:CGRectMake(0, 360, 375, 50)];
    UILabel *lable6 = [self buildLabelWithFrame:CGRectMake(0, 440, 375, 50)];
    UILabel *lable7 = [self buildLabelWithFrame:CGRectMake(0, 520, 375, 50)];

    //系统默认字体
    lable1.font  = [UIFont systemFontOfSize:[UIFont systemFontSize]];
    //小字体尺寸
    lable2.font = [UIFont systemFontOfSize:[UIFont smallSystemFontSize]];
    //标签用字体
    lable3.font = [UIFont systemFontOfSize:[UIFont labelFontSize]];
    //按钮用字体
    lable4.font = [UIFont systemFontOfSize:[UIFont buttonFontSize]];
    //粗体字
    lable5.font = [UIFont boldSystemFontOfSize:30];
    //斜体字
    lable6.font = [UIFont italicSystemFontOfSize:30];
    //使用“Courer-Bold”字体
    lable7.font = [UIFont fontWithName:@"Courer-Bold" size:30];
}
//创建标签
-(UILabel*)buildLabelWithFrame:(CGRect)frame{
    UILabel *lable = [[UILabel alloc]init];
    lable.frame = frame;
    lable.backgroundColor = [UIColor greenColor];
    lable.textAlignment = NSTextAlignmentCenter;
    lable.text = @"不同的字体";
    [self.view addSubview:lable];
    return lable;
}

@end

三、UIColor

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    UILabel *lable1 = [self buildLabelWithFrame:CGRectMake(0, 40,  375, 50)];
    UILabel *lable2 = [self buildLabelWithFrame:CGRectMake(0, 120, 375, 50)];
    UILabel *lable3 = [self buildLabelWithFrame:CGRectMake(0, 200, 375, 50)];
    UILabel *lable4 = [self buildLabelWithFrame:CGRectMake(0, 280, 375, 50)];
    UILabel *lable5 = [self buildLabelWithFrame:CGRectMake(0, 360, 375, 50)];
    
    //使用系统预设颜色
    lable1.backgroundColor = [UIColor greenColor];
    //使用系统字体所用颜色
    lable2.backgroundColor = [UIColor lightGrayColor];
    //使用自定义颜色，指定RGB的值
    lable3.backgroundColor = [UIColor colorWithRed:0.9 green:0 blue:0.5 alpha:1];
    //使用自定义颜色，指定HSB的值
    lable4.backgroundColor = [UIColor colorWithHue:1 saturation:1 brightness:1 alpha:1];
    //根据指定图片创建类似的颜色
    lable5.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"photo"]];
}
//创建标签
-(UILabel*)buildLabelWithFrame:(CGRect)frame{
    UILabel *lable = [[UILabel alloc]init];
    lable.frame = frame;
    lable.textAlignment = NSTextAlignmentCenter;
    [self.view addSubview:lable];
    return lable;
}

@end